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无知的代价什么是生态平衡，从以下三例中便可略知一二，也仅仅是略知一二对青蛙的恐惧澳大利亚种有大批甘蔗，本世纪初从非洲引进一种特大型青蛙，用来帮助农民对付危害甘蔗的甲虫。这种青蛙长３０厘米，体重可达３公斤，叫起来声音宏亮。这些新“移民”到了澳大利亚立即...
What is the cost of ignorance What is ecological balance, from the following three cases can know one or two, but also just know one or two frogs fear Australia has a large number of sugar cane, early this century from Africa to introduce a large frog, with To help farmers deal with beetles that endanger sugar cane. The frog is 30 cm long and weighs 3 kg, making it loud and loud. These new “immigrants” arrived in Australia immediately ...