在汤姆停下来的时候，他们正要下楼开始挖。
They were just about to go downstairs and start digging when Tom stopped.
有时候我会去下楼的健身房。
第二天早上，她下楼的时候，遇见父亲正从书房里走出来，手里拿着一封信。
The next morning, as she was going down stairs, she was met by her father, who came out of his library with a letter in his hand.
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