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![Pregnancy ultrasound scans: an overview - BabyCenter](https://www.iarticlesnet.com/pub/img/site/s_01.jpeg)
Pregnancy ultrasound scans: an overview - BabyCenter
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日期:2024-07-14
An ultrasound scan involves transmitting high frequency sound waves through ...
First trimester: If you are very unsure of how many weeks pregnant you are you ......看更多