这让毒狼不仅能在地面上狩猎还能在树上进退自如。
These things can hunt in the trees as well as on the ground.
平面的色块在空间内进退自如，不动声色地呈现其深度。
Flat colors move freely in the space, presenting its profundity quietly.
只能进不能退的规则不适合调车作业，调车作业要求进退自如。
The rule that no retreat, only advance is allowed in shunting does not suit shunting operation.
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