Microcosmic space is the hollow ball that has limit, it is not the ball of Poincare conjecture.

选择大型篮或妨碍为此，一个有很多空洞空间。

youdao

If you can imagine Jupiter AS a hollow ball, all of the other planets would fit inside and there would still be a lot of room left.

你是否能想象木星如同一个空的球，那么把所有的其它行星都放到里面，它仍然还剩有许多空间。

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The egg automatically 'reprogrammed' its DNA until it reached a stage of the embryo known as a blastocyst — a hollow ball of 50 to 100 cells.

合成后的新细胞自动按照植入DNA序列“重新编程”，直到胚胎进入囊胚期，即由50至100个细胞组成的一个中空的球形幼胚。

youdao

You have a tube, a transparent--a tube--a hollow tube, and at the top of the tube you throw a ball through so it whips through the tube and it comes out.

用一根管子,一根透明中空的管子,从管子最上面,你丢进去一个小球,小球迅速穿过管子,飞出来

耶鲁公开课 - 心理学导论课程节选

That led to a blastocyst, a hollow ball of 50 to 100 cells.

WSJ: Experiment Brings Human Cloning One Step Closer