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4
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This week highlights

It's a date!

Our calculator can determine your due date based on the date of your last menstrual cycle or the date of conception.

The embryonic stage begins

“很显然,单独一个年度,即使是创记录的年度,不可能告诉我们很多关于气候变化趋势的东西,”德国波茨坦气候影响研究所地球系统分析部门主管斯德范·拉姆斯朵夫(Stefan Rahmstorf)说。“然而,有记录以来的最热年度是2014年、2010年和2005年的这个事实清楚地表明,全球变暖并没有‘在1998年停止’,像一些人喜欢错误地宣称那样。”
Several South Korea-linked entities have already felt Beijing’s wrath in response to the Thaad plans. Chinese state news agency Xinhua last month issued a stark warning to Lotte, one of South Korea’s biggest companies, for giving up land on which the Thaad platform will be hosted.

Consider carrier screening

It's a simple blood or saliva test to see whether your baby is at risk for any genetic disorders, such as cystic fibrosis or sickle cell disease.

36 weeks to go!

You're in your first month

Fetus icon

Baby development at 4 weeks

Your little embryo

综合考虑,这些事实与战略规划凸显了中国航天工业的认知——为了成为有竞争力的全球飞机制造商,中国需要拓宽行业的广度与深度。在他们掌握了价值链的两端——飞机设计与集成组装后,中国意识到长期处于价值链中游的组装和子系统地位将摧毁他们的航空业。这就是为什么中国雄心勃勃地与波音、空客等飞机制造商以及美国通用电气公司、劳斯莱斯等发动制造商竞争,形式前所未有地激烈。
神经系统科学家发现了小脑的一项全新功能。长期以来人们一直认为小脑基本上与意识直觉等活动无关,它的主要作用是协调站立、呼吸等基本的身体活动,然而,实际上小脑在影响人类行为上也发挥着重要作用。
n. 检查,视察
More recently, however, General Motors made a self-driving car in 1958 that adjusted its steering wheel based on the alternating currents given off by a wire placed inside the road. While the vehicle did actually drive itself, it does not qualify as the first autonomous vehicle because it depended on wires placed inside the ground. The world's first autonomous vehicle was made by S. Tsugawa and several of his colleagues at Japan's Tsukuba Mechanical Engineering Laboratory. However, German engineer Ernst Dickinson is regarded as the pioneer of the autonomous car. In 1987, he developed the VaMoRs which was capable of traveling more than 90 kilometers per hour (55 mph) for about 20 kilometers (12 mi). Seven years later, he made the VaMP, which could recognize road signs, know its own position in a lane, detect other vehicles, and even decide when to change lanes. And a year after that, he and his team made another autonomous vehicle which traveled from Germany to Denmark. The vehicle had a maximum speed of 180 kilometers per hour (111 mph) and was controlled by a human for about 5 percent of the journey.

embryo made up of hypoblast and epiblast
Your baby at 4 weeks Tap the plus for more details
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Your baby is about the size of a poppy seed

poppy seed

Primitive placenta

5月30日,日本南部海岸附近发生了强烈地震,使中国民众担心,继2011年后,类似海啸和福岛核电站熔融的大灾难会再次发生。不过,最后并没有出现人员死亡或重大损毁的报道。
? Heavy snow has fallen in West Virginia, with up to 17 inches in Webster Springs. The National Weather Service has warned that more is on the way.
2.听觉矫治专家

embryo in uterus at 4 weeks
Your body at 4 weeks Tap the plus for more details

Amniotic sac and yolk sac

Although the average punctuality rate of the surveyed airports rose 7% year-on-year to 70.4% in 2016, the average delay time was 33 minutes.
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See what fraternal twins look like in the womb this week.

Pregnancy symptoms during week 4

No symptoms?

Don't worry. Many women don't feel anything yet this week. In fact, most early pregnancy symptoms don't start until about 6 weeks.

Tender, swollen breasts

Breast tenderness can be one of the earliest signs of pregnancy. It usually starts around 4 to 6 weeks and lasts through the first trimester.

Fatigue

For many women, exhaustion is one of the first signs of pregnancy. But other women hardly seem to slow down at all.

Nausea or vomiting

Morning sickness can strike at any time of day. It usually starts around 6 weeks of pregnancy but can begin as early as 4 weeks. Some women have cramping as well.

上海率先启用新版银行在线查询不动产登记信息系统 可网查家庭房产信息

If you've been charting your temperature and it stays elevated for 18 days in a row, you're probably pregnant.

Pregnancy checklist at 4 weeks pregnant

Take a pregnancy test

If you haven't already, you should be able to find out whether you're pregnant. For the most accurate results, wait until a few days after you miss your period before you take a pregnancy test.

Make a prenatal appointment

If the test is positive, call your doctor or midwife and schedule your first prenatal appointment. In the meantime, you can calculate your due date, but remember that it's just an estimate. You're just as likely to go into labor any day during the two weeks before or after.

LED专利厮杀激烈,这些企业是如何“突围”的?

If you've been trying to conceive with no success for a year or more (or for six months if you're over 35), talk to your healthcare provider about a workup for you and your partner to spot possible fertility problems.

4 weeks pregnant bellies

This week's video

Show sources

ACOG. 2015. FAQ156. Prenatal development: How your baby grows during pregnancy. American College of Obstetricians and Gynecologists. 这句简练、言之有物、几乎可称之为妙语的话提醒我们,即便接下来的奖项都相当雷人,还是有人能够做到直白的。 [Accessed May 2019]

FDA. 2014. Home Use Tests: Pregnancy. U.S. Food and Drug Administration. 年龄:50岁 [Accessed May 2019]

March of Dimes. 2015. Prescription drugs, over-the-counter drugs, supplements and herbal products. ['sep?reit] [Accessed May 2019]

Mayo Clinic. 2015. Prenatal vitamins: Why they matter, how to choose. 现代中国经销商Wang Rongzhen7月20日向路透社指出,现代汽车已经缩减提供给中国进口经销商的产品阵容,仅提供一款车型供销售,而在中国国产的车型不断增加。 [Accessed May 2019]

MedlinePlus (ADAM). 2015. Fetal development. 保障房里首次有了“暖心驿站” [Accessed May 2019]

Kate Marple is an award-winning journalist with more than 25 years of experience writing and editing health content.   
 
 
 
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