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unimportant; not serious; it doesn't matter; never mind; it looks all right, but
no; not so; (bound form) not; un-
(bound form) to demand; to coerce
tight; strict; close at hand; near; urgent; tense; hard up; short of money; to tighten
没关系，迟到一点不要紧，安全最重要。
Practice each character