grading by weight

• 分级

grading by weight的用法和样例：

例句

1. Wrestlers are divided according to their weight.
   摔跤选手按体重分级。
2. And the further researches on ASC by computer vision are proposed.
   最后，基于对苗木自动分级问题的理解，提出了苗木自动分级方法的一些展望。