中肠上皮细胞游离面具发达的微绒毛，前、后盲囊上皮细胞有柱状和杯状两种形态；
The free side of the epithelium cells of midgut was covered with abundant microvilli, and there were two types of cells in the epithelium of anterior and posterior midgut cecum;
绒毛微动脉在顶部与绒毛微静脉有交通支，形成毛细血管前动静脉吻合。
There were connecting vessels between the villi arteriole and the villi venule at the tip of the villi, and they form a precapillary arteriovenous anastomosis.
在排卵前通常是注射人绒毛膜促性腺激素后34—36小时取卵。
The eggs are retrieved before ovulation occurs, usually 34 to 36 hours after the hCG injection is given.
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