It is easy for the coach, but harder for the coacher.

教练过程是简单的，但是对教练师来讲是难的。

His enthusiasm on Pingpong is contributed to the influence of his father, a famous Pingpong coacher.

他对乒乓球的热爱是受他父亲, 一位著名的乒乓球教练的影响.