Tropical monsoons bring ample rainfall to keep the acidic soils thin and bare.

热带季风带来的丰沛降水，使酸性沙壤土养分稀薄。

Channelled by Yunnan's unique geography, they bring with them the moisture of the tropical monsoon.

因云南独特地形的引导，它们带来热带梅雨季节的湿气。

But the modelling suggested that such drastic changes in the energy balance in the upper atmosphere could play havoc with tropical monsoons, the seasonal rains on which the agriculture and economy of many countries depend.

但模型表明， 高层大气能量平衡的这种剧烈变化可能会对热带季风造成严重破坏，热带季风是许多国家农业和经济所依赖的季节性降雨。