动词短语
中文翻译：紧密分离
同义词：
['closely fractionating', 'closely fractionated', 'tightly fractionated']
例句：
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1.The process of close fractionating is crucial for the purification of oil.
紧密分馏过程对于石油的提纯至关重要。
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2.During the close fractionating process, the molecules are broken down into smaller pieces.
在紧密分馏过程中，分子被分解成更小的部分。
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3. The close fractionating technique has been used to separate different types of oils.
紧密分馏技术已被用来分离不同类型的油。