1、正如科学家所预言的那样，全球污染成了人类面临的最严重的问题之一。

As predicated by scientists,the global pollution has become one of the most serious problems which humans are faced with

2、谋求这些职位的竞争很激烈————今年的求职者是去年的五倍。

The competition of these jobs is very tough -- we have five times applicants than last year.

3、正如事实表明的那样，教育大纲应符合国家的经济发展计划。

As the fact shows，the educational program should to fit into the national plan for economic development.

4、这辆汽车太费油，而且价钱几乎是我想付的两倍。

This car burn too much gas，moreever the price is almost twice as much as I plan to pay.

5要了解一起重大的国际事件，我们首先需要考虑其历史与政治背景。

To understand a great international event ,at first we need consider the historical and political background.