2.　 an active / a live volcano 活火山

1.　 a volcano erupting 一次火山爆发

7. Your contribution counts. 你的贡献很有价值。

Unit 5　 The power of nature

6. Together, individuals make a difference.　 众人拾柴火焰高。

5. It is the greenhouse effect that gives the earth’s surface the average temperature of 15℃ .

温室效应使得地球表面的平均气温达到了15℃.

4. Some people think future global warming would cause the sea level to rise by several meters; others predict severe storms, droughts, famines, the spread of diseases, and the destruction of species.

有人认为全球变暖会导致海平面上升好几米;也有人预言会出现严重的风暴、干旱、饥荒、疫病和物种的灭绝．

3. Without the “greenhouse effect”, the earth would be about thirty-three degrees Celsius cooler than it is.

如果没有这种 “温室效应”，地球的温度将比现在的温度还要低33摄氏度左右。

2. There is no doubt that the earth is becoming warmer but there is fierce debate over whether it is human activity that has caused this global warming or whether it is just a natural phenomenon.

毋庸质疑的是地球正在变暖,但关于它变暖的原因是由于人类活动所致还是一种自然现象还存在激烈的争论。

1. That probably doesn’t sound very much to you or to me but it is a rapid increase compared to most natural changes.

这对你我来说很可能是无所谓的，但是跟多数自然变化相比较而言，这却是一种快速的增长。

25.　 greenhouse effect 温室效应