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Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
为主要事项做准备；初步的,介绍性的,预备的。
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为主要事项做准备；初步的,介绍性的,预备的。；表示在更重要的事情之前或为其准备的行动或事件；旨在在继续之前熟悉情况；初步的；开始的；预备的
In preparation for the main matter; initial, introductory, preparatory.
a preliminary investigation
初步调查。
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为主要事项做准备；初步的,介绍性的,预备的。
In preparation for the main matter; initial, introductory, preparatory.
表示在更重要的事情之前或为其准备的行动或事件；旨在在继续之前熟悉情况
denoting an action or event preceding or in preparation for something more important; designed to orient or acquaint with a situation before proceeding
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Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.