(1)unlike prep.与......不同；不像；adj.不同的，不相似的

(2)unlikely adj.不大可能的

(3)likely adj.可能的

be likely to do sth.可能做某事

It is likely that...有可能......

(1)But unlike her school friends,16­year­old Sarah is not spending half­term resting.

但是和她学校里的朋友不同，16岁的Sarah没有花半学期的时间来休息。(2017·全国Ⅲ)

(2)This is unlikely to be the whole story.

情况可能并非完全如此。

(3)It is likely that he will be in Beijing this autumn.

今年秋天他可能在北京。

[句型转换]

(4)It's likely that he will attend the meeting.

→He is likely to attend the meeting.

3．It was not immediately obvious that water was to be fundamental to the development of life.水对生命的发展会起关键作用，这一点在当时并不明显。

fundamental adj.基本的；基础的；根本的

be fundamental to sth.对......是必不可少/至关重要

(1)There is a fundamental difference between the two points of view.这两个观点有一个根本区别。

(2)A knowledge of Chinese is fundamental to any understanding of this problem.

汉语知识对于理解这个问题是必不可少的。

4．What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.

很多科学家相信，由于地球上长期有水存在，使地球得以把有害气体和酸性物质溶解在海洋里。

(1)harmful adj.有害的

be harmful to对......有害

(2)harmless adj.无害的；不致伤害的

(3)harm n．& v．损害；危害

do sb.harm/do harm to sb.对某人有害

There is no harm (in) doing sth.做某事无害处。

(1)It is harmful to your eyes to read in the sun.

在阳光下看书对你的眼睛有害。