露水的形成不但需要一个晴朗无云的夜晚，能产生强烈辐射散热和无风或微风这两个条件。上述两个条件只是产生露水的外因。而充足的水汽却是产生露水的内部条件，没有这个决定性条件，再好的外界条件也是无用的。
因为尽管你晚上辐射散热条件再好，温度降得很低，而空气中本来只有很少的水汽，怎么也达不到饱和或过饱和，就不可能有水珠凝结出。旱天由于地表水分在白天不断蒸发散失，又得不到雨水的补偿，因此空气中水汽也只能是越来越少，空气中水汽少当然是不能够形成露水的。
custom is a second nature.习惯是后天养成的。custom makes all things easy.有个好习惯，事事皆不难。diamond cuts diamond.强中自有强中手。dont make a mou
1. While there is life, there is hope.有生命就有希望/留得青山在，不怕没柴烧。2. Misfortunes tell us what fortune is.不经灾祸不知福。3. If a thing i
First love is unforgettable all ones life.初恋是永生难忘的。In the very smallest cot there is room enough for a loving pair.哪怕是最小
1. Councils of war never fight.主战者不打仗。2. Counsel after action is like rain after harvest.放马後炮。3. Counsel must be followe
On cloud nine.飘飘然如上九重天。Save for a rainy day.未雨绸缪。Fish bite best before a rain.大鱼吃小鱼，天空要下雨。For a morning rain leave not y
Fortune favours the bold.勇者天佑。A bully is always a coward.只有懦夫才会恃强凛弱。The devil take the hindmost.落后者遭殃。Faint heart never
Kill two birds with one stone.一箭双雕；一举两得。Fine feathers make fine birds.人要衣装，马要鞍。Birds in their little nests agree.同巢之鸟心儿齐
The best fish swim near the bottom.好鱼常在水底游。Never offer to teach fish to swim.不要班门弄斧。Go to the sea, if you would fish wel