kāixiàn [come unsewn] 衣物缝线崩开 衣物等的缝合处因线断而裂开：裤裆开了线了。
vt. split
misc. setting out
本文以标准渐开线直齿圆柱齿轮作为研究对象。
The standard involute cylinder gear is studied in this paper.
但是如果你开始找到的线头就是好的，解开线团会更容易。
But if your first pulls are good ones, the untangling becomes easier with each move.
年复一年，开线者和攀爬者在Muir山谷以及其他岩场的一些仰角路线上留下了快挂。
Quickdraws have been left hanging on several overhanging routes in Muir Valley, as well as other climbing venues, over the years by developers and climbers.
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