英语语法分析

According to the right-hand rule, they would be spinning, by our convention, anticlockwise.

由右手定律我们知道，按惯例，它们会逆时针旋转。

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。

The rest of the shell is rolled towards the tooth in an anticlockwise direction, in order to remove it.

为了脱身，其余的壳就会以逆时针方向绕着牙齿旋转。