《梁书·列传·卷五十五》
及至被围困时间很久，虽然内外断绝，但守备尚很坚固。
及被围既久，虽外内断绝，而备守犹固。
Even when he was besieged for a long time, although the inside and outside were cut off, the defense was still very strong.
<s>[INST] 将以下现代汉语文本改写为文言文: 及至被围困时间很久，虽然内外断绝，但守备尚很坚固。 [/INST] 及被围既久，虽外内断绝，而备守犹固。</s>
将以下现代汉语文本改写为文言文: 及至被围困时间很久，虽然内外断绝，但守备尚很坚固。
user
及被围既久，虽外内断绝，而备守犹固。
assistant