| 单词 | mutual improvement |
| 释义 | Definition of mutual improvement in English:mutual improvementnoun historical
OriginMid 19th century; earliest use found in Thomas Low Nichols (1815–1901). Definition of mutual improvement in US English:mutual improvementnoun historical
OriginMid 19th century; earliest use found in Thomas Low Nichols (1815–1901). |
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