1、The laevogyrate direction of the screw ensures that it screws in counterclockwise.
这种螺丝的左旋方向确保了逆时针旋转。
2、Some substances have laevogyrate optical rotation, while others have dextrorotatory optical rotation.
一些物质具有左旋光旋光性,而另一些具有右旋光旋光性。
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