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BNC: 7076 COCA: 7869
ineffective

adjective

VERBS | ADVERB | PREPOSITION VERBSbe, prove, seem無效;證明無效;似乎無效These policies have proved ineffective.事實證明這些政策並不奏效。become變得無效make sth, render sth使⋯不起作用;使⋯無效The contract was rendered ineffective by this careless wording.措辭不慎致使這份合同失效。ADVERBextremely, fairly, very, etc.效果極其/相當/非常不好highly效果極其不好completely, entirely, totally完全無效;絲毫不起作用largely在很大程度上無效politically政治上不起作用PREPOSITIONagainst對⋯無效These weapons are totally ineffective against tanks.這些武器在坦克面前根本不起作用。in在⋯方面無效chemicals that are very ineffective in killing weeds除草效果很差的化學品

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