保护森林生态平衡请不要砍伐病树森林中的病树是生态平衡不可缺少的一部分。这些病树为森林中的鸟类和其它动物提供了“避难所”。然而近些年，森林里的病树都被砍伐掉了，不少国家的森林中已经没有了病树的踪影。为保持森林自然的生态平衡，美国科学家研究出注射寄生菌获... Protecting the ecological balance of forests Do not deforest trees Tree disease in forests is an integral part of ecological balance. These diseased trees provide “shelters” for birds and other animals in the forest. However, in recent years, the diseased trees in the forest have been cut off, and many countries have no traces of diseased trees in their forests. In order to maintain the natural ecological balance of the forest, the United States scientists have developed an injection of parasites ...