He suggested that bees which make hexagonal cells evolved in steps from bees that made round cells, under pressure from natural selection to economise wax.

他认为，建筑六角形蜂房的蜜蜂是从建筑圆形蜂房的蜜蜂进化而来；是在节省蜡的自然选择压力下的几个进化阶段形成的。

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RESULTS: Satellite cells grew and differentiated well, and finally the single nucleus round cells changed into the multinuclear cast myotube shaped cells gradually.

结果：卫星细胞生长、分化良好，最终由单个核圆形细胞逐渐变化为多个核的长圆柱的肌管状细胞。

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At high magnification, the nests of carcinoid tumor have a typical endocrine appearance with small round cells having small round nuclei and pink to pale blue cytoplasm.

高倍镜下，类癌的细胞巢有典型的内分泌外观，有小圆细胞，核小而圆、细胞浆粉红色到浅兰色。

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It's no longer just a round spherical mass of cells, but it has some structure.

不再只是一个球状的细胞团,它有了一定的结构

耶鲁公开课 - 生物医学工程探索课程节选

One way round this problem would be to find an alternative source of nerve cells.

ECONOMIST: Something new in mind

It causes the cells to lose oxygen very easily, turning them from round shapes to crescent shapes that cause painful episodes known as pain crises.

CNN: Sickle cell patient refuses to let disease define her

The brain cells have been taught how to control the robot's movements so it can steer round obstacles and the next step, say its creators, is to get it to recognise its surroundings.

BBC: Rat-brain robot aids memory study