捻向（direction of twist）：加捻后，单纱中的原丝或股纱中的单纱呈现的倾斜 方向。从右下角倾向左上角的为S 捻；从左下角倾向右上角的称为Z 捻。
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Use a meter, the first cover to tighten slightly in the direction of twist, to loosen the direction of twist.
使用开表器时，可先将后盖向旋紧的方向稍微拧一下，再向旋松的方向拧。
As the yarn is twisted, internal forces are built up in the direction of the twist.
当纱线被加捻的时候，在捻度的方向上也会相应地形成内应力。
Butt at one time, handedness (twist direction of the shell) was equally distributed within some snail species that have become predominantly dextral or, in a few species, predominantly sinistral.
然而现在已经变为右旋占多数的蜗牛种类，其旋向性（壳的螺旋方向）一度也曾均衡分布，在某些种类中，甚至左旋曾占优势。 。
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