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.
介绍了壳体缩口模具结构及成形工艺，若对凹模加以更换，完全可以用一副模具完成壳体两次缩口成形。
The paper has described the necking die structure and the forming process for shell bodies. If the necking die was changed, two necking process can be finished with a set of die.
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