点击下方单词,选择对的这个单词
及物动词
不及物动词
1. (使)变得粗糙;(使)变得不平滑If something has been roughened, its surface has become less smooth.
1. make rough or rougher
e.g. roughen the surfaces so they will stick to each other
多通过句子记忆单词,而不是单独死记硬背。