Daniel tries for some time but he fails.

丹尼尔试了几次但是失败了。

youdao

He tries to get the apple above the shelf. But he fails to reach it. After a while, Brown comes in and try showing his ability.

他努力去够架子上的苹果，但是没能够到。过了一会儿，布朗近来尝试表现他的能力。

youdao

He tries to remain emotionally detached from the prisoners, but fails.

他想尽力保持对囚犯们不掺杂个人感情，却做不到。

《柯林斯英汉双解大词典》

But often he fails. The expression was born in the military forces.

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But he fails to grasp the real significance of what Obama is doing and what is actually happening in relations between the two communities.

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You bill him but he fails to pay you.

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But if he fails to deliver his election promises, they may come back to haunt him.

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