One major problem did present itself, though.
不过，确实出现了一个重大问题。
But once you see the opportunity present itself, are you prepared to seize it?
但是一旦机会在你面前了，你准备好抓住它了吗？
Somehow the right chance never seemed to present itself.
不知怎么搞的，似乎始终没有出现适当的机会。
The opportunity to do certain things in life can present itself in unexpected ways.
生活中的某些机会是以你意想不到的方式出现的。
One major problem did present itself though.
不过，确实出现了一个重大问题。
It twitched back and forth, waiting for a target to present itself.
它来回伸缩着，等待着目标的出现。
It twitched back and forth, waiting for a target to present itself.
它来回伸缩着，等待着目标的出现。
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