I was lost in thought when I felt a bump.
我想得出了神，这时，我感到被撞了一下。
The sudden knocking at the door startled me when I was lost in deep thought.
我正在沉思，突如其来的敲门吓了我一跳。
I sighed in relief when I found the money I thought was lost.
当我找到以为丢掉的钱时，我宽慰地叹了口气。
I sighed in relief when I found the money I thought was lost.
当我找到以为丢掉的钱时，我宽慰地叹了口气。
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