All the efforts of the police to break through the human ring were useless.
警察为突破这个人群圈子所做的一切努力都是无用的。
You can say that the climate issue works like this too: local efforts are useless.
气候问题也是这样的，可以说，局部的努力是没有用的。
我们的一切努力都白费了。
In other words, the initial efforts may turn out to be useless to management.
换句话说，开始的努力可能对管理变成无用的。
He knew that his efforts were useless.
他指导他的努力是徒劳的。
He knew that his efforts were useless.
他指导他的努力是徒劳的。
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