他认为，在任何时候，蝴蝶都可能展开翅膀，收缩自己的身体。

He thought that at any time, the butterfly might spread its wings, shrink the body.

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蛇慢慢地展开了盘着的身体。

The snake slowly uncoiled.

《牛津词典》

如果你把它们展开，你会发现它们含有特定的基因，特定的 DNA 序列，这些基因序列有助于决定身体细胞的发育。

If you stretch them out you will find they contain certain genes, certain sequences of DNA that help determine how the cells of the body will develop.

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