假段定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号()，并在其下面写出该加的词。删除：把多余的词用(＼)划掉。修改：在错的词下画一横线，并在该词下面写出修改后的词。
American scientists say they believe that when trees can warn each other to danger. They do it by sending out chemical into the air. The studies carried out by scientists confirmed the theory announcing by the National Science Foundation. The scientists say they find that when trees are under attack by disease or pests, near trees take the same defensive actions like the trees being attacked. And they say it appears that the trees being attacked may produce send out chemicals to warn the others trees. What amazing it is!