问题描述： 树对人类的作用是什么用英语怎么说? 1个回答 分类：英语 2014-09-28 问题解答： 我来补答 what is the effect of trees for human?which the effect is of trees for human?这里强调是的用法 所以the放在effect前 对人来说用介词for 在能帮助您的情况下 顶下我吧!祝开心快乐.the effect of trees is that people can use they to build the house 展开全文阅读
