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im-
[im- 词源字典]
variant of
in-
before
-b-, -m-, -p-,
in the sense of "not, opposite of" (
immobile, impersonal
) as well as "in, into" (
implant, impoverish
). See
in-
. In some English words it alternates with
em-
(1).
[im- etymology, im- origin, 英语词源]