1. 尝试，试图（尤指做困难的事）
    If you attempt to do something, especially something difficult, you try to do it.

    e.g. The only time that we attempted to do something like that was in the city of Philadelphia...
           只有在费城那次我们曾试着做那样的事。
    e.g. Before I could attempt a reply he added over his shoulder: 'Wait there.'
           还没等我回答他就回头又说了一句：“在那儿等着。”

2. （通常指不成功的）尝试，企图，试图
    If you make an attempt to do something, you try to do it, often without success.

    e.g. ...a deliberate attempt to destabilise the defence...
           经过深思熟虑的破坏该防御的尝试
    e.g. It was one of his rare attempts at humour.
           那是他极不常见的想要表现幽默的一次。

3. 杀人企图
    An attempt on some-one's life is an attempt to kill them.

attempt的解释

    e.g. ...an attempt on the life of the former Iranian Prime Minister.
           试图杀害伊朗前总理

4. （运动员创造纪录的）尝试，冲击
    In British English, if a sportsman or sportswoman makes an attempt on a sporting record, they try to beat it. In American English you say that they make an attempt to break it.

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    e.g. Everything is almost ready for me to make another attempt on the record.
           一切几乎都已准备就绪，就等我向纪录发起再一次冲击了。