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
put/bring 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 in/from(=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
501. (a) passion for 对...的热爱,热情
502. be patient with 对...耐心
503. pay for 赔偿, 付款, 报偿, 处罚
504. pay...for 付...的钱
505. (be) at peace with 与...和睦相处
in
peace (=peacefully)安静,平安
506. peculiar to... 特有的, 独具的
507. penalty for 对...的处罚,罚金
508. perform on the piano(=play the piano)

演奏钢琴
509. persist in 坚持,固执
510. in person 亲自, 当面

• operate [´ɔpəreit] v.(使)运转；操作；经营 (初中英语单词)
• passion [´pæʃən] n.激情；激怒；恋爱 (初中英语单词)
• peculiar [pi´kju:liə] a.特有的；奇异的 (初中英语单词)
• originate [ə´ridʒineit] vt.发源；创造；引起 (高中英语单词)
• penalty [´penlti] n.刑罚；惩罚；障碍 (高中英语单词)
• persist [pə´sist] vi.坚持；固执；持续 (高中英语单词)
• participate [pɑ:´tisipeit] v.参与；分享；带有 (英语四级单词)
• outskirts [´autskə:ts] n.外边；郊区 (英语六级单词)