“无效”怎么读

如果可的松无效，我恐怕只能动手术了。If the cortisone doesn't take, I may have to have surgery.令人震惊的是，这种既无效又危险的手术直到20世纪30年代才被废止。Shockingly, this useless and dangerous surgery did not end until the 1930s.一份官方法令宣布在首都举行的投票无效。An official ...

“无效”的英语可以翻译为：of no avail，to no avail，invalid，null and void，be of no effect ...

“无效”的反义词：有效, 收效, 灵验。...