导读：词组能有效的帮助大家提高完型和句子的理解与写作质量，为保证大家能够灵活运用考研重点词组，社科赛斯李梅老师特配以相应的例句，帮助大家更快地获得更高的分数。
631. on second thoughts 经重新考虑
On second thoughts he changed his mind.
进一步考虑后，他改变了主意。
632. out of danger 脱离危险
The patient is out of danger.
病人脱离危险了。
633. on the basis of 根据，在...的基础上
Statement should be made on the basis of fact.
说话要有根据。
634. on the contrary 正相反
On the contrary, I have tons of things to do.
正相反，我有一大堆事要做。
635. on the grounds of 根据，以...为由
We refused to publish the report on the grounds of cost.
因费用的关系，我们拒绝公布这份报告。
636. on the other hand 另一方面
On the other hand, the idea appealed to him.
从另一方面来说，这个想法又使他很感兴趣。
637. on the whole 总的来说，大体上
On the whole he is right.
大体上他是对的。
On the whole, the situation is not entirely gloomy.
总的来看，形势并非一团糟。
638. on/upon the point of 即将...之时，正要...的时候
He was on the point of saying something when the phone rang.
他正要说话时电话铃响了。
639. once for all 一劳永逸地，永远地
I will explain it once for all.
我会彻底解释清楚。
640.once in a while 偶尔
Once in a while she phoned him.
她偶尔会给他打个电话。
