我背对着他们,所以看不见他们在做什么。

I had my back to them, so I couldn't see what they were doing.

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I had my back to them, so I couldn't see what they were doing.

to 在这里是介词,表示方向或方位关系,指"朝向...的方向"或"面对..."。在这个句子中表示"背对着某人"的方位关系。

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