假设地表降温而其上的空气升温，那么地表的空气要向上升腾就变得不那么容易；而对流减少导致的将会是趋向于减少的云层生成和降雨。
If the surface is cooled and the air above it warmed, there is less tendency for air from near the surface to rise; reduced convection will tend to lead to fewer clouds and reduced rainfall.
螺旋推进器快速旋转，生成必要的上升力，使平台升起。
The spinning of the propellers generates the necessary lift, or upward force, to raise the platform.
美国国会预算局估计，老龄化将只占未来数十年内健康卫生成本上升因素的四分之一，在其他发达国家，该比例也大致相仿。
The CBO estimates that ageing accounts for only a quarter of the health-care inflation to come in the next few decades, and the share in other rich countries is similar.
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