有一次,我在小区里玩,突然,我看见一只燕子在低飞,不一会儿,就开始下起了大雨。我边走边想:燕子为什么要低飞呢?
我回家以后,疑惑地说:“爸爸你知道燕子为什么要低飞呢?”爸爸说:“我不知道,你自己去查查吧?”我一打开电脑,查了一下,原来,各种小昆虫是燕子的美味食物。燕子以各种小昆虫为食。每当快要下雨时,空气里的水汽含量剧增,将大多数昆虫的翅膀沾湿,使他们只能沿着地面爬动;而伏居在土壤里的昆虫由于气压降低,湿度增大,便纷纷爬出土外透气,燕子低飞可以捕获食物,所以燕子低飞还常预示将要下雨。看到这些,我突然恍然大悟。我把这些告诉了妈妈,妈妈说我:“长大了,会自己查东西了。”我心里比吃了蜜还甜。
只要有一双处处会发现的眼睛,就能发现更多有趣的现象。
Nowadays, advertisements can be found everywhere in big cities. They shout at us from the television screen and radio loudspeakers, wave to us from every page of the newspaper, signal to us from the roadside billboards all day and flash messages to us in colored lights all night.
Faced with a flood of advertisement, some people wonder whether it is necessary to have such huge sums spent on advertising. They often cite in illustration of it the attractive, but false and deceptive advertisements to which many consumers fall victim. Why don't we stop advertising and use the money to reduce the price of goods? It sounds like a good idea, but they fail to notice the contribution advertising makes to our society. Because the production of a better product to compete for customers' money is the goal of advertisers, customers are thus given a chance to compare their products and get the best and cheapest one. Besides, as the advertisement can provide people with a lot of immediate and detailed information as to the availability of a certain product, or a service or a job, it makes life much more convenient. And another thing we mustn't forget: the fact that we pay so little for our daily newspapers and TV programs is due entirely to the money spent by advertisers.
Advertising performs such a useful service to our society that we can't imagine what would happen if there were no advertisements. (198 words
那天,我正准备回家,突然,我看见几只燕子正贴着地面飞,有的飞的高点,但绝对不超过3米。这些燕子除了都低飞之外,还有一个共同点,那就是它们都时不时的张开嘴。
这些事情看起来都很不以为然。但是,这些燕子为什么能在高空中飞呢?那这样燕子为什么不在高空中飞行呢?这一连串的问题随之而来。
我做过种种假想,这些燕子是不是在玩耍?这些燕子是不是炫耀自己?这些燕子是不是正在比赛? 这些燕子是不是在争取雌燕子的芳心呢?但是这些假想后来又被我统统推掉了。
为了弄清楚这个问题,我还为此查阅了资料。
电脑上说:燕子低飞是有两个原因,有一种原因是:因为在某些时间空气会很潮湿,一些昆虫的翅膀也会随着变成很湿很重的,昆虫的翅膀变湿变重了以后,昆虫飞起来就有些力不从心了。而在高空中飞行呢,阻力又十分大,所以有一些昆虫就选择了在低空中飞,因为在这些昆虫之间,有一些小虫子是燕子喜欢吃的。所以燕子为了捕捉到这些食物,就也在低空中飞行了。
我得到的启示是:多观察才能有所得。
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