VERBS | ADVERB | PREPOSITIONVERBS➤be, 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。ADVERB➤extremely, 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PREPOSITION➤against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