junior和younger区别

junior是初级的意思，而younger则是更年轻的意思，区别可以从以下例子看出：

These are junior students in our school, but there are many younger students who will come next term, they are new students. 这些是我们学校的低年级学生，但是下学期会有很多更年轻的学生，他们是新生。