If your zip sticks, it might be because a thread has caught.
如果你的拉链拉不动，那有可能是因为有根线卡住了。
Adjusting the needle thread tension.
上线张力的调节
a needle and thread
针线
Beeswax: used to coat thread for easier threading.
蜂蜡：为了易于穿线，它用来给线打蜡。
I need a long piece of cotton thread.
我需要一根长长的棉线。
※Pride may lurk under a threadbare cloak. 骄傲可能披著老一套的外衣出现。 ※Friends tie their purses with a cobweb thread. 朋友之间,不应扎紧钱袋. ※As every thread of gold is valuable, so every moment of time. 一寸光阴一寸金.
