end of medium

例句：

1. 1. The length of the rope is exactly the end of the medium.
   绳子的长度正好是中点的。
2. 2. The teacher explained the problem at the end of the medium.
   老师在中点处解释了这个问题。
3. 3. The car's engine has a tendency to overheat at the end of the medium.
   汽车的发动机在中点处有过热的倾向。