if he does't keep quiet,he'll have to leave the library.保持句子意思
问题描述：
if he does't keep quiet,he'll have to leave the library.保持句子意思
答
翻译?那就是 如果他不保持安静,他将必须要离开图书馆
如果是换种说法,可以是...
he'll have to leave the library unless he keeps quiet