求翻译：以向右横行为例（向左横行为对称运动），右足收缩，产生的向右拉力使蟹身向右移动。左足伸展，产生向右推力是蟹身向右移动。是什么意思？

Right to run amok, for example (left rampant symmetrical movement), right foot contraction, the right tension to make the crab body to move to the right. Left foot stretch, resulting in right thrust is to move to the right of the crab body.

In order to run amok as an example (right to left to run amok is a symmetric movement), and the right foot, and the resulting contraction right tension to a move to the right place. From left to right, thrust is being moved to the right place.

Take towards right runs amuck as the example (towards left runs amuck for symmetry of movement), the right foot contracts, has towards right the pulling force to cause the crab body towards right to move.The left foot extension, has towards right the thrust force is the crab body towards right moves

To traverse to the right as an example (cross-symmetric movements to the left), right foot contraction, pull to the right makes the shells moved to the right. Left foot stretch, producing thrust to the right is the shells moved to the right.

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