•Engineers are endeavouring to locate the source of the problem.工程师们正竭尽全力查找问题的根源。

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•In spite of our best endeavours, it has proven impossible to contact her.尽管我们尽了最大的努力，但最后还是未能联系上她。

•Crossing the North Pole on foot was an amazing feat of human endeavour.徒步穿越北极是人类探索领域的一次壮举。