Adoption of practices which improve output per unit of available moisture are critical to the achievement of high yields 应用能够改善单位有效水分生产力的措施对取得高产是非常关键的。
2.
The reliance on readily available moisture also explains why tropical cyclones can only survive over the warm oceans and invariably weaken once over land 热带气旋依赖水汽提供能量，说明了它只可在温暖的海洋上生存及在陆上无可避免地减弱的原因。
