这也是晴好天气下，白天由于热力作用产生对流，于是上升气块就发展成淡积云、浓积云、积雨云，到傍晚太阳逐渐西沉，热力影响失去赖以生存的条件----太阳光照，因而热力作用渐趋消失，对流作用也渐趋停止。
对流一旦停止，上升气流来源也就停止，于是淡积云、积雨云不但不能继续发展而且连维持生存也已经开始困难了，首先它从底部先开始消散，积雨云顶部也就脱离母体形成了“乌云脱云脚”的情况。因为产生这种乌云是地方性热力影响所致，不是系统天气影响所致，因而第二天仍然可预兆为晴好天气。
He sits no sure that sits too high.高处不胜寒。He that respects not is not respected.欲受人敬，要先敬人。So said, so done.说到做到。言出必行。Hast
Where there is a will, there is a way.有志者，事竟成。Well begun is half done.好的开端是成功的一半。East, west, home is best.金窝、银窝，不如自己的草窝。
1.Practice makes perfect. 熟能生巧。2.God helps those who help themselves. 天助自助者。3.Easier said than done. 说起来容易做起来难。4.Where t
do as you would be done by.己所不欲，勿施于人。doing is better than saying.与其挂在嘴上，不如落实在行动上。do it now.机不可失，时不再来。do nothing by halve
As fresh as a daisy.生动活泼Beauty is a fading flower.美人暮年The flower of one's youth.精英Flower of youth.含苞欲放push up the da
all rivers run into the sea. 百川入海。all roads lead to rome. 条条道路通罗马。all's fair in love and war. 爱情和战争是不择手段的。all's
1.things unreasonable are never durable.不合理的事不会长久。2.too many cooks spoil the broth.厨子成群，煮坏肉羹。3.too much liberty spoils a
1. most things have two handles.多数事物有两种解释。2. music is the eye of the ear.音乐是耳朵的眼睛。3. necessity and opportunity may make