他小心地取下了夹在外套上的一根线头。

He carefully removed a strand of thread that was caught on his jacket.

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He carefully removed a strand of thread that was caught on his jacket.

strand 是名词,指"细线、纤维或毛发的一股",通常用来描述细长的线状物。在这里指"一根线头"。

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