480. it occurs to sb. that… 某人想到… 481. once and for all =once and forever永远地 all at once (=suddenly， now) 立即，马上 once in a while (=occasionally) 偶尔 (just) for once 就这一次 482. (all) by oneself 独自(没有别人帮助) 483. operate on sb. 给某人做手术 operation n. come go into operation开始运转 putbring sth. into operation 使…投产，运转 484. be of the opinion 持有…的看法 485. in one's opinion 按某人的看法 486. be opposed to… 反对… 487. be opposite to 与…相反的 488. (be) in order(=acceptable)合适的，恰当的 in order 井井有条，处于良好状态; out of order(=in bad condition)出毛病，发生故障 489. made to order 定做的(衣服) 490. originate infrom(=begin)起源于，由……引起 491. on the outskirts (of) 在城郊 492. owe…to 把…归于… 493. on one's own (=along， without help)单独 494. of one's 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 (=give up， sell) 舍弃，卖掉 498. participate in (=take part in)参加 499. (be) particular about 讲究，挑剔(吃，穿) 500. in particular (=especially) 特别是，尤其
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