Were there no friction, we could not walk.
要是没有摩擦力，我们就不能行走。
We were so tired that we could not walk any further.
我们太累了，因此无法再往前走了。
We have been exhausted and could not walk any further. We have to return towards home.
我们已筋疲力尽，再也走不动了，只好掉头回家。
We could not leave him alone not even for a minute when he was able to crawl and sit but not very stable while not able to walk.
在他会爬坐不太稳还不会走路的这一段，一分钟也离不开人。
We could not leave him alone not even for a minute when he was able to crawl and sit but not very stable while not able to walk.
在他会爬坐不太稳还不会走路的这一段，一分钟也离不开人。
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