汤姆有一个弟弟。

Tom has a brother.

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汤姆有两个弟弟，一个是老师，另一个是医生。

Tom has two brothers. One is a teacher, and the other is a doctor.

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汤姆：有啊，我有一个姊姊，一个弟弟。

Tom: Yes, I has one elder sister and one younger brother.

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他是一个像汤姆弟弟一样有经验的工程师。

He is as experienced an engineer as Tom's younger brother.

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他是一个像汤姆弟弟一样有经验的工程师。

He is as experienced an engineer as Tom's younger brother.

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