所有的人都住在一个大工厂附近，她在当地的水里发现了一种叫做铬的化学物质。

All the people lived near a big factory and she discovered that there was a chemical called chromium in the local water.

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我哥、我妹和我在一个大工厂工作。

My brother, my sister and I work in a big factory.

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我在一个大工厂上班，他也是。

I work in a very big factory, so does he.

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