然后，我还得爬过各种单股或双股的绳索和绳梯，才能到达那块木板。

From there, I needed to scramble over various single - or double-stranded cables and horizontal rope ladders before reaching the plank, which I now could see was hinged to the structure.

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接着，它又跳上我的双股坐下，看着我。

Then he leaped onto my lap and sat down, eyeing me.

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它们是形似呼拉圈的双股dna单位，可以被轻易地从一个细胞转移到另一个细胞。

These are hula-hoop-shaped double-stranded units of DNA that can be moved easily from one cell to another.

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