coach是以ch结尾的，所以要加es，例如：
1、The two rival coaches got together after the game to compare notes.比赛后，双方教练聚在一起交换看法。
2、Parents of advanced-math students and Math Counts coaches say the children are on the website constantly.学习高等数学的学生家长和Math Counts的教练们说孩子们经常在线学习研讨。
3、He coaches basketball and soccer.他执教篮球和足球。
