扭结：一段长度的材料产生的绷紧的卷曲，曲折或弯曲，例如因拉紧线的有环部分。

A tight curl, twist, or bend in a length of thin material, as one caused by the tensing of a looped section of wire.

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这是由于长期的拉紧头发，会导致头发逐渐脱落，尤其是在发际线处。

It is caused by chronic pulling of the hair, leading to gradual hair loss, mostly at the hairline.

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从左脚开始，拉紧你刚才留在鞋底上的平针是它沿着硬纸板的脚趾部位形成自然的弯曲，线末端打结以固定形状。

Starting with the left foot, pull the running stitches you added earlier on the sole so it curls naturally around the cardboard toe. Knot the ends of the thread so that it stays in place.

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It's - a suture or a stitch has to hold the wound closed so it has to have certain mechanical strength and imagine the problem of making something that's dissolvable so it disappears but also is strong enough to hold a wound closed reliably for a length of time.

能够拉紧切口的缝合线,就必须具有一定的机械张力,大家想像一下制造这种缝合线的难度,身体组织不仅要能吸收这种缝合线,而且这种线必须有足够的张力,一定时间内能够拉紧切口

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