The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.

植物的祖先是进行光合作用的单细胞生物，由此产生的植物可能缺乏真正的根、茎、叶和复杂的生殖结构，如花朵。

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Nonetheless, there are indications that single-celled organisms can learn.

尽管如此，仍有迹象表明单细胞有机体可以学习。

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Single-celled organisms emerged from the primordial soup about 3.4 billion years ago.

单细胞生物大约出现于34亿年前的“原始汤”（primordial soup）。

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His research began with fruit flies, but over the last two decades, his focus has been on parasitic protozoa, single-celled organisms that cause major diseases.

VOA: standard.2010.04.05

We talked about last time that part of the process of going from this single cell to multi cellular many celled organisms like we are is cell division.

我们上节课说过,从一个单细胞分裂形成大量细胞,构成的器官的过程,叫做细胞分裂

耶鲁公开课 - 生物医学工程探索课程节选

The single-celled organisms appeared to be harmless, though we were cautioned not to touch anything, to keep the windows shut, to wash our hands.

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At the time, Venter was trying to accelerate the process of sequencing whole genomes, first one-celled organisms, but ultimately gearing up to take on the decoding of the human genome.

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But even if single-celled organisms are all we can manage to discover in the foreseeable future, Darling is eloquent about the ways in which such findings are now changing how we think about our own existence.

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