| 单词 | co- | 
| 释义 | co- pref. 1.  Together; joint; jointly; mutually: coeducation. 2.  a.  Partner or associate in an activity: coauthor; cofounder. b.  Subordinate or assistant: copilot. 3.  To the same extent or degree: coextensive. 4.  Complement of an angle: cotangent. [Middle English, from Latin, variant of com-, com-.] | 
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