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1·You owe a certain person a sum of money.

你欠着某人一笔钱。《柯林斯英汉双解大词典》

2·A certain person called on me yesterday.

昨天有人来找过我。

3·A certain person called on me yesterday.

某个人昨天拜会了我。

4·A certain person called on you yesterday.

昨天有个人来拜访过你。

5·Everything's going well until a certain person comes in.

一切进展顺利，直到某个人的到来。

6·For example, you can search for work items that belong to a certain person.

例如，您可以搜索属于特定人的工作项。

7·If a certain person has a particular role in the tradition, document that too.

如果某个人在那个传统中扮演着特殊的角色，也一并记录下来。

8·A certain person (ie somebody that I do not wish to name) told me everything.

有个人把一切都告诉我了。

9·It is excellent news, capital news, and about a certain person that we all like.

这是个好透了的消息，头等重要的消息，说的是关于我们大家都喜欢的某一个人。

10·It could be a real or fictional place, in the company of a certain person or on your own.

这个地方可以是现实生活中存在的，也可以是虚构的，里面也可以有其他人或者只有你自己。