|
481 once and for all =once and forever永远地 all at once 立即,马上 once in a while 立即,马上 once in a while 偶尔 for once 就这一次 482. by oneself 独自 483. operate on sb. 给某人做手术 operation n. come/ go into operation开始运转 put/bring sth. into operation 使投产,运转 484. be of the opinion 持有的看法 485. in ones opinion 按某人的看法 486. be opposed to 反对 487. be opposite to 与相反的 488. in order合适的,恰当的 in order 井井有条,处于良好状态; out of order出毛病,发生故障 489. made to order 定做的 490. originate in/from起源于,由..引起 491. on the outskirts 在城郊 492. oweto 把归于 493. on ones own 单独 494. of ones own某人自己的 495. keep pace with 跟齐步前进 496. go to great pains=take pains 下功夫,努力 497. part with 舍弃,卖掉 498. participate in 参加 499. particular about 讲究,挑剔 500. in particular 特别是,尤其 | 
