问题描述：
这个step 为什么不用复数形式?
As he came forward,for all his step(就是这个) was firm and elastic,they could see that fatigue bore(bore这个词何解?查了词典但是觉得上面的解释不满意) heavily upon him.
As he came forward,for all his step(就是这个) was firm and elastic,they could see that fatigue bore(bore这个词何解?查了词典但是觉得上面的解释不满意) heavily upon him.
问题解答：
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