clear 
英 [klɪə]  美 [klɪr] 
adv. 清晰地；完全地

v. 变清澈；使清楚；扫除，清除；清（嗓子）；跳过，通过；结清；放晴

adj. 清澈的；清晰的；明确的；晴朗的，明亮的；无瑕疵的；畅通的

例句：
The clear message of the scientific reports is that there should be a drastic cut in car use. 

这些科学报告的寓意非常清楚，那就是应该大幅度削减汽车使用量。

A spokesman said the British government's position is perfectly clear. 

一位发言人表示，英国政府的立场再清楚不过了。

It became clear that I hadn't been able to convince Mike. 

很明显，我没有能够说服迈克。

At that time it wasn't clear in my mind what had happened. 

那时我心里并不明白发生了什么。

I am quite clear in my mind that we need to change. 

我心里非常明白我们需要改变。