球心到某几何体各面的距离相等且等于半径的球是几何体的内切球。如果一个球与简单多面体的各面或其延展部分都相切,且此球在多面体的内部,则称这个球为此多面体的内切球。与圆柱两底面以及每条母线都相切的球称为这个圆柱的内切球,此圆柱称为球的外切圆柱。与圆台的上、下底面以及每条母线都相切的球,称为圆台的内切球,此圆台称为球的外切圆台。
纳希切万 Nakhichevan 内切球 inside cut (golf) 切 absolutely (not), to grind, close to, eager, to correspond to, to cut, to slice, tangent (math), definitely ..
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食既:太阳与月球第一次内切,太阳光球刚完全被月球掩蔽的时刻。
Fresh both: the sun and the moon within the first cut, sun-moon has just been totally masking the moment.
在每一个细胞内,都有一个像球一样的部分,这叫细胞核,它组织细胞内的一切活动。
In every cell there is a part like a little ball. This is the nucleus, which organizes the work of the cell.
在拒绝了费内巴切提供的合同之后,阿皮亚成为目前转会市场中的自由球员。欧洲多家球会都在追逐他。
Appiah is available on a free transfer after cancelling his contract at Fenerbahce and he is being chased by a number of clubs throughout Europe.
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