四肢脊椎动物长在后身的腿；人迈步时后面的一只脚back foot; back foot
前脚一滑，后脚也站不稳。
As the front foot began to slide the back foot also lost its balance.
紧跟在后面close behind
我前脚进了门，他后脚就赶到。
No sooner had I got in than he arrived just behind.
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