二十、That is the reason why ~~~ （那就是...的原因）
例句：It costs an astronomical sum of fund to lock up so many criminals and that’s the reason why imprisonment has imposed a great strain on the budget of a nation.
把如此多的罪犯关押起来需要耗费大量资金，那就是为什么监禁已经大大增加了国家负担的原因。

二十一、For the past + 时间，S + 现在完成式...（过去...年来，...一直...）
例句：For the past decade or so, practical courses, such as computer and business, have gained tremendous popularity on college campuses.
过去十年来，实用性课程诸如电脑和商科在大学中普遍盛行。

二十二、Since + S + 过去式，S + 现在完成式。
例句：Since the advent of modern urbanization, people have been confronted with the dilemma whether or not they should demolish old houses and buildings that seem to have spoilt the cityscape.
自从现代城市化的进程开始之后，人们一直面临着这样一种两难的境地：他们是否应该拆除那些是否有损市容的旧房屋和建筑物。

二十三、It pays to + V ~~~ （...是值得的。）
例句：It pays to create a fair atmosphere in which both males and females cooperate and compete on an equal footing.
创造一个让男女平等合作竞争的良好环境是值得的。

二十四、be based on （以...为基础）
例句：The progress of thee society is based on harmony.
社会的进步是以和谐为基础的。

二十五、Spare no effort to + V （不遗余力的）
Developed nations should spare no effort to finance their economically disadvantaged counterparts.
发达国家应该不遗余力地资助贫国。

二十六、bring home to + 人 + 事 （让...明白...事）
例句：We should bring home to the masses the significance of space research.
我们应该让人们明白太空研究的重要性所在。

二十七、be closely related to ~~ （与...息息相关）
例句：Expanding population and influx of migrant workers are closely related to the problem.
人口激增与外来民工大量涌入与交通问题息息相关。

二十八、There exists the possibility of + Ving (存在...的可能性)
There exists the possibility of wronging an innocent person
    有可能冤枉无辜的人。

二十九、Due to/Owing to/Thanks to + N/Ving, ~~~ （因为...）
例句： Thanks to coeducation system, benign competition and cooperation between male and female students are rightly encouraged.

由于男女共校的教育体制，异性同学间的良性竞争和友好合作精神得到了发扬。

三十、Only...can （只有...才能）
例句：Only in cities can children be well prepared for their future life and keep up with the trend of the world.
只有在城市里孩子们才能为他们未来的生活作好准备并与世界趋势同步。

三十一、Leave much to be desired （令人不满意）
例句：The condition of our traffic leaves much to be desired.
我们的交通状况令人不满意。

三十二、Have (exert, impose) a great influence on ~~~ （对...有很大的影响）
例句：Quality of citizens has a great influence on a nation’s prosperity.
国民的素质对于国家的繁荣有重大的影响。

三十三、do good to （对...有益），do harm to （对...有害）
例句：Reading does good to our minds.读书对心灵有益。
Overwork does harm to health.工作过度对健康有害。

三十四、Pose a great threat to ~~ （对...造成一大威胁）
例句：abortion poses a great threat to both women’s physical and mental health.
堕胎对于妇女的身心健康都会造成巨大威胁。

三十五、do one‘s utmost to + V = do one‘s best （尽全力去...）
例句：schools should do their utmost to ensure the students’ sound growth.
学校应尽全力去确保学生的健康成长。

they began a steep rise which peaked at about 3.3% in 1989. The figures fell sharply in 1990 and remained steady over the next year. The conviction rate then fell gradually until 1994 with hardly any change over the next four years.