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a. 不明确的,未下定义的

uncouthness, uncover, uncovered, uncritical, uncritically, uncrossed, uncrowned, uncrumpled, UNCTAD, unction, unctuous, unctuously, unctuousness (also unction), uncurl, uncut, undaunted, undeceive, undecided, undeclared, undefended, undemanding, undemonstrative, undeniable, undeniably, under, under arms, under control, under the charge of, under the heel of, under the order of, under way, under-, under-secretary, under-sexed, under-side, underachieve, underachiever, underact, underarm, underbelly,