点击下方单词,选择对的这个单词
1. 复杂的;难以解决的;棘手的A knotty problem is complicated and difficult to solve.
2. 有节的;多节的Knotty wood has a lot of small hard areas on it where branches once grew.
多通过句子记忆单词,而不是单独死记硬背。