热带雨林，为什么总下雨？

Rainforests are hot and wet all year. 热带雨林一年到头又热又湿。 The sun shines strong every day. 太阳天天都晒得很猛。 Water rises up from the leaves and rivers. 水汽从树叶和河面上升起来。 The wet air cools and forms clouds. 湿空气一凉，就变成了云。 The clouds fall back as rain. 云又变成雨水落下来。 So it rains there almost every day. 所以那里几乎天天下雨。