《论衡·卷八·儒增篇》
人的筋骨不是木头和石头，不能不松懈。
人之筋骨，非木非石，不能不解。
People's muscles and bones are not wood and stone, and they cannot be relaxed.
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 人的筋骨不是木头和石头，不能不松懈。 [/INST] 人之筋骨，非木非石，不能不解。</s>
Convert the following modern Chinese text into Classical Chinese: 人的筋骨不是木头和石头，不能不松懈。
user
人之筋骨，非木非石，不能不解。
assistant