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You owe a certain person a sum of money.
你欠着某人一笔钱。
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A certain person called on me yesterday.
昨天有人来找过我。
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A certain person called on me yesterday.
某个人昨天拜会了我。
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A certain person called on you yesterday.
昨天有个人来拜访过你。
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Everything's going well until a certain person comes in.
一切进展顺利,直到某个人的到来。