formal (especially in business letters) about; on the subject of(尤用于商务信函中)关于,兹就,事涉
used in the subject line of an email when it is a reply to another email, followed by the subject of the original message(用于回复电子邮件时的标题行,在被回复的邮件的标题之前)
used to add the meaning "do again", especially to verbs(加在动词前表示“再做”)重,又,再
returning something to its original state(表示使…恢复原状)
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