肥水塘的鱼确实难钓,这是笔者屡屡受挫的切身感受,但如能象医生给患者切脉做出正确的诊断,便可对症下药,乃至药到病除。为什么肥水塘的鱼难钓,笔者认为主要有三个原因。一是食物充足,鱼根本没有饥饿感,当然也就没有觅食和进食的欲望;二是溶氧匮乏,鱼和人一样时刻离不开氧气。如 It is hard for the fish in the pond to catch fish. This is the frequent frustration of the author. However, if the doctor can give the correct diagnosis to the patient through the hepatic vein, he can prescribe the right remedy and even cure the patient. Why fish ponds difficult to catch fish, I think there are three main reasons. First, adequate food, fish have no hunger, of course, there is no desire to feed and eat; the second is the lack of dissolved oxygen, fish and human beings can not do without oxygen. Such as