名词
中文翻译：封闭的集合
同义词：
['closed portfolio', 'closed collection']
例句：
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1. The museum has a closed collection of ancient artifacts.
这家博物馆有一套古代文物的收藏。
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2. The artist's closed collection is displayed in the gallery.
艺术家的收藏品陈列在画廊里。
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3. The company's closed collection includes rare books and antiques.
这家公司的收藏包括稀有书籍和古董。