我们用木头把那座旧楼房撑住，以免倒塌。

We blocked up the old building for fear that it should collapse.

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他用一根粗大的木头把墙撑住。

He shored up the wall with a thick balk of wood.

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然后把你空着的另外一只脚撑住岩壁形成一个稳定的三角。

You can then brace your spare foot against the wall to form a stable tripod.

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然后把你空着的另外一只脚撑住岩壁形成一个稳定的三角。

You can then brace your spare foot against the wall to form a stable tripod.

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