他在攀岩时用手臂撑住岩石以保持平衡。

He braced his arms against the rock to keep his balance while climbing.

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He braced his arms against the rock to keep his balance while climbing.

braced 是动词 brace 的过去式,brace 的意思是"支撑、使稳固",指用身体部位或物体来提供支撑力以保持稳定。

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