The genetic code decides whether they sit with a slight twist towards clockwise or anticlockwise.
基因密码决定了它们的排列是稍向顺时针方向还是向逆时针方向扭曲。
按顺时针方向转动旋钮。
When it is rolled clockwise by your right hand, an S-twist yarn will become tighter and a Z-twist yarn looser.
如果你用右手顺时针的旋转它，S捻的纱线会越变越紧，Z捻的纱线会越变越松。
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