trimester of pregnancy, first
头三个月
;
;
前;;;
;
期;，胎儿;trimester of pregnancy, first
头三个月
trimester of pregnancy, second
中三个月
trimester of pregnancy, third
末三个月
the first trimester of pregnancy.
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
胎儿，以显示积水性无脑畸形。
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