蒸发是指液体转变为气体的过程。

___Evaporation is the process of a liquid changing into a gas.

随着时间的推移，他对这项计划的热情逐渐消退了。

His enthusiasm for the project is slowly ___evaporating over time.

高温加速了植物叶片的水分蒸发。

High temperatures speed up the ___evaporation of water from plant leaves.