401. on one's guard 警惕,提防
402. on one's own 独立,独自
403. on purpose 故意地
404. on sale 出售,廉价出售
405. on schedule 按时间表,准时
406. on second thoughts 经重新考虑
407. on the contrary 正相反
408. on the grounds of 根据,以...为由
409. on the other hand 另一方面
410. on the point of 即将...的时刻
411. on the road 在旅途中
412. on the side 作为兼职/副 业
413. on the spot 在场;马上
414. on the whole 总的来说,大体上
415. on time 准时
416. on(an/the) average 平均,通常
417. once (and) for all 一劳永逸地
418. once again 再一次
419. once in a while 偶尔
420. once more 再一次
421. once upon a time 从前
422. one another 相互
423. one's cup of tea喜欢的人/物
424. open to不限制,开放的
425. opposite to在对面
426. or else 否则,要不然
427. or so 大约,左右
428. other than 非;除了
429. out of breath 喘不过气来
430. out of control 失去控制
431. out of date 过时的
432. out of doors 在户外
433. out of order 出故障的
434. out of place 不适当的
435. out of practice 久不练习,荒疏
436. out of sight 看不见,在视野外
437. out of the question 毫无可能的
438. out of touch 不联系,不接触
439. out of 从...中;由于;缺乏
440. over and over (again) 一再地,再三地
441. parallel to与...平等,类似
442. particular about挑剔,讲究
443. patient with有耐心
444. peculiar to独特的,独有的
445. pick up捡
446. play by ear见机行事
447. popular with受...喜爱,爱戴
448. prior to 在...之前
449. pull one's leg拿某人开玩笑put someone on
450. put someone up给某人提供住宿
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