《北史·列传·卷七》
于是不停声地痛哭流泪，断气而死，年仅二十一岁。
于是歔欷流涕，绝气而死，年二十一。
So he cried and shed tears without ceasing, and died of breath at the age of twenty-one.
<s>[INST] Convert the following English text into Classical Chinese: So he cried and shed tears without ceasing, and died of breath at the age of twenty-one. [/INST] 于是歔欷流涕，绝气而死，年二十一。</s>
Convert the following English text into Classical Chinese: So he cried and shed tears without ceasing, and died of breath at the age of twenty-one.
user
于是歔欷流涕，绝气而死，年二十一。
assistant