形容词
中文翻译：保留的
同义词：
['unused', 'untouched', 'unused']
例句：
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1. The library has a lot of books that are reserved for special guests.
图书馆有很多书籍是专门留给特殊客人的。
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2. The old house was reserved for the family's use only.
这所老房子只供家人使用。
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3. The reserves were carefully monitored to ensure they were used wisely.
储备物资被仔细监控，以确保它们被明智地使用。