1) John was looking for an envelope and got sidetraked reading some old letters.
2) 例子: I got sidetraked by the question from my colleague and forgot to take the disk.
场景: 整理要送的资料时被同事的问题分神，到目的地发现光盘没带。
3) lousy糟糕的
Where was I 说到哪了
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