你听说过鱼因不会游泳而淹死的事吗?如果谁有这样的担忧,就和那个被嘲笑了几百年的担心天会塌下来的杞国人没什么差别了,必定会成为人们的笑料。作为本能,鱼儿天生就会游泳,如果有人想教鱼儿howto swim,这和在鲁班门前卖弄使斧头的功夫有什么差异呢?因此,teach a fish how to swim的含义就是“班门弄斧”。 Have you ever heard of a fish drowned because it would not swim? If anyone had such worries, it would be no different from the ridiculous people who had been ridiculed for hundreds of years and would fall apart Jokes. As an instinct, the fish will naturally swim, if someone wants to teach the fish howto swim, which is different from playing in the Luban door so that the ax? Therefore, the meaning of teach a fish how to swim is ".