The soldiers are standing at attention.

士兵们立正站着.

《简明英汉词典》

The soldiers are standing at attention now, listening to the colonel.

士兵现在正在立正站着, 听着上校发命令.

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Because we are all standing at attention for 5 minutes.

因为我们要在操场上立正五分钟.

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There were something like 500 soldiers standing at attention.

大约有五百名士兵立正立正站着.

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