#每日学单词#obtuse/əbˈtjuːs/形容词：1. Annoyingly insensitive or slow to understand 迟钝的、愚钝的；例：Klein was being deliberately obtuse it seems to me. 2. (of an angle) more than 90° and less than 180°钝角的 3. Not sharp-pointed or sharp-edged; blunt不尖利的、钝的
#每日学单词#swamp /swɒmp/: 名词An area of low-lying, uncultivated ground where water collects; a bog or marsh 沼泽、湿地；动词Overwhelm or flood with water陷入、淹没；例：When the flood swamped the classroom, she was struggling in the water along with her classmates.