We face away from each other, simply two girls standing back to back.

我们就是两个背靠背站着的女孩，互不照面。

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The children are standing back to back in long rows.

孩子们正一排排背靠背地站着。

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The children are standing back to back in long rows.

孩子们正一排排背靠背地站着。

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