blunted edge

例句：

1. 1. The car's engine has a blunted edge, making it difficult to start.
   这辆车的引擎有一个钝的边缘，很难启动。
2. 2.His writing is blunted, lacking the finesse of his earlier works.
   他的写作变得迟钝了，缺乏他早期作品的细腻。
3. 3. The old man's eyes were blunted by years of hard work.
   老人的眼睛因为多年的辛勤工作而变得迟钝。