my friend becomes quiet when his girlfriend is angry with him
当我朋友的女朋友生他的气时，他就变得沉默了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
My friend becomes quiet when his girlfriend is angry with him; today he is quiet and so I deduce she is angry.
我的朋友在他的女朋友生他的气的时候就会变得沉默，今天他很沉默，所以我推断她生气了。
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