trimester of pregnancy, first
妊娠头三个月
;;;
儿，;;;，儿;
妊娠妊娠trimester of pregnancy, first
妊娠头三个月
trimester of pregnancy, second
妊娠中三个月
trimester of pregnancy, third
妊娠末三个月
the first trimester of pregnancy.
妊娠
头三个月
The skull is opened in this third trimester stillborn fetus to reveal hydranencephaly.
此处打开颅骨来自一个7-9月死产
儿，以显示积水性无脑畸形。
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