顽固到每一根头发丝 shineyale
一根头发丝
A strand of hair
以上为机器翻译结果，长、整句建议使用 人工翻译 。
一根头发丝也有自己的影子。
Even a single hair have its own shadow.
youdao
Even a single hair has its own shadow.
削木需要非常精准和平滑，甚至一根头发丝的缝隙都不能有。
The cutting should be so precise and smooth that even a thread of hair cannot slip through the cracks.
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