Each smaller thread is thinner than a human hair.
每根更小的线都比人的头发还要细。
Edison also worked hardest to find the perfect filament, trying carbonised thread, beard-hair and very tightly rolled calling CARDS, before lighting on the ideal material, bamboo from Japan.
爱迪生曾为了找到完美的纤维，辛苦地工作着，在发现理想的材料一种日本竹纤维之前，他尝试过碳化纤维、须发和卷得非常紧的名片。
The cutting should be so precise and smooth that even a thread of hair cannot slip through the cracks.
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。
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