actual evaporation的用法和样例：
例句
- There is generally more evaporation over the oceans and more precipitation over the land.
通常在海洋蒸发量较大，而陆地上则降水量较大。 - Normally, in tropical regions where the sun is very strong, the ocean salinity is higher than it is in other parts of the world where there is not as much evaporation.
通常热带地区阳光强烈，而其他地区海水蒸发量不如热带地区那么大，因此这些地区海水咸度要高些。
