以下为句子列表：
英文: A monkey infant enters the birth canal headfirst, with the broad back of its skull against the roomy back of the mother's pelvis and tailbone.
中文: 猴儿进入产道时，头下脚上，较宽的后脑勺顶著母猴骨盆背面和尾椎的宽敞空间。
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英文: Approximately 24 hours after her temperature drops, she can be expected to enter the first stage of labor, when the cervix dilates and opens the birth canal for the passage of puppies.
中文: 大约在体温下降后24小时，当母犬的子宫颈扩张，产道打开，即进入了分娩的第一个步骤。
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英文: Babies acquire their gut flora as they pass down the birth canal and take a gene-filled gulp of their mother's vaginal and faecal flora.
中文: 婴儿在经过产道并充分“摄取”富含细菌基因的母体阴道分泌物和粪便菌落之后，细菌便开始进入胃肠道。
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英文: In contrast to the twisted birth canal of modern humans, monkeys' birth canals maintain the same cross-sectional shape from entrance to exit.
中文: 因为猴子的产道与人类的不同，直筒筒的，横切面的形状没有变化。
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