在发育过程中，口凹是在第三期无节幼虫时内陷形成，而原肛是在第六期无节幼虫时内陷形成的，所以口凹的发生早于原肛的发生。
In the course of development, the invagination of stomodeum occurs earlier than that of proctodeum at the third and the sixth nauplius stages respectively.
外侧胫骨平台呈杯口状，外侧股骨髁出现凹迹和内侧髁间棘高于外侧髁间棘在三组间无统计学意义。
The incidence of cupping of the lateral tibial plateau and notching of the lateral femoral condyle show no statistical differences.
贾平凹的《秦腔》是难以让人一口气读完的一部书，但这并不影响人们对它的喜爱和称道。
Jia Pingwa's Qin qiang is a book that makes it hard for the reader to finish it at once, but this does not influence the love and praise of the readers for it.
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