On the other side are parents like Mike jia, one of the thousands of Asian-American professionals who have moved to the district in the past decade,who said Aderhold's reforms would amount to a "dumbing down,"of his children's education.
2018年6月四级真题（第一套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
ADJ
哑的;不能说话的
Someone who is dumb is completely unable to speak.