with all one's might
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彼は試験のために一生懸命勉強している。
He is studying very hard for the exam.
子どもたちは一生懸命走っていた。
The children were running with all their might.
一生懸命説明したが、うまく伝わらなかった。
I explained as hard as I could, but it did not come across well.