词汇讲解：

1. reservoir n.蓄水池; 贮液器
例句：Today the lake is a reservoir and popular salmon fishing location.
今天，这面湖成了一座水库也是捕捞鲑鱼的胜地。

2. melt vi.熔化，溶解
例句：Continental ice will continue to melt.
南极大陆的冰川将持续消融。

3. release vt.释放; 放开
例句：He had won his first release from the fences of home. 
他第一次成功地脱出家庭的樊笼。 

4. present vt.介绍; 出现
例句：But some soups present bigger challenges.
但有些汤呈现出很大的变化。

5. operation n.操作，经营
例句：This operation is called concatenation.
这项操作成为连接。

6. endanger vt.危及
例句：As countries try to save themselves they endanger each other.
当各国试图在拯救自身时，他们也在相互危及着对方。


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