肚脐。
肚脐。
A navel.
种脐。
A hilum.
许多螺旋形贝壳基部中央的凹陷或开口。
A depression or opening in the center of the base of many spiral shells.
羽毛羽轴上的两个孔之一。
Either of the two apertures in the calamus of a feather.
连接宇航员或航天器与母船的管道,用于传递补给和样本。
A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred.
曲面上各法截线曲率均相等的点。
A point of a surface at which the curvatures of the normal sections are all equal to each other.
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Dictionary facts from ECDICT, WIKTIONARY.
