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3、下面集合中属于线程安全的类是（ ）。
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1、Collection接口的特点是元素是无序、可重复的。
When we read, we should not take the fixed phrases (固定词组) as a thought group.
We should take the phrases as the thought group according to their grammatical functions in sentences.
The so-called “thought group” refers to a group of words closely related in meaning and grammatical structure. This group of words includes some key words and non-key words, in which key words provide key information, whilenon-key words are used to express auxiliary information.
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