And Siemens, a German electronics and engineering giant, recently launched an ultrasound scanner which allows expectant mothers to see their unborn child in 3-d.
德国的电子和工程巨头西门子，最近发布了一套超声波扫描仪，可以让孕妇看到待产胎儿的3维影像。
The phenomenon could be caused by mothers getting more sun in pregnancy - and passing on higher quantities of vitamin D to their unborn infant.
导致此类现象的原因可能是母亲在孕期接受的日照更多，然后将大量的维生素D传输给了他们还未出生的婴儿。
James Pivarnik, Ph. D., FACSM, says that hundreds of studies have shown physical activity to be not only safe, but beneficial, for expectant mothers.
美国运动医学会会员JamesPivarnik博士说，有数以百计的研究表明，孕妇体力活动不仅安全，而且有利。
James Pivarnik, Ph. D., FACSM, says that hundreds of studies have shown physical activity to be not only safe, but beneficial, for expectant mothers.
美国运动医学会会员JamesPivarnik博士说，有数以百计的研究表明，孕妇体力活动不仅安全，而且有利。
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