再如79页,提到强制对流时,convection is caused by an upthrust. A region of cold air just floats in the cold air around it because it displaces its own weight. However, when heated,it expands. It weights the same as before,but now displaces more cold air, so the increased upthrust pushes it upwards。注释: upthrust 抽风
再如82页,background radiation 地面辐射
再如111页,global temperatures have always fluctuated。 注释 fluctuate 脉冲