[詞典] filament; leptotene; leptonema; threadlet;
[例句]當我們把水桶從井裏提上來，發現繩子幾乎要磨斷了，水桶僅由壹根細線吊著。
When we drew the bucket up from the well, we saw that the rope had worn away, and the bucket was left hanging by a very thin thread.