英语语法分析

The total precipitable water in atmosphere is astronomical observation and meteorology.

大气总水汽量是天文观测和气象科学领域最为重要的参量之一。

The calculating results show that the precipitable water is well related with the ground water vapor pressure.

计算结果表明，可降水量和相应的地面水汽压之间，存在着良好的数值对应关系。

Cloud fraction, precipitable water, precipitation, and water vapor changes larger in north hemisphere than south one.

云量、可降水量、降水、水汽的变化是北半球大于南半球。