improver
改進者;改進物;學徒,練習生
Im·prov·er n. One who, or that which, improves.
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improver
n 1: someone devoted to the promotion of human welfare and to
social reforms [syn: humanitarian, do-gooder]
2: a component that is added to something to improve it; "the
addition of a bathroom was a major improvement"; "the
addition of cinammon improved the flavor" [syn: addition,
add-on]