术语：板凳教练、Head Coach
说明：
首席教练是总教练底下的教练，主要工作是辅助总教练并给予建言，或协助下达战术。
如遇总教练因故缺席或遭禁赛时，由首席教练暂时代理总教练职务。
有时也称为板凳教练或副总教练。
在日本职棒中，称为ヘッドコーチ、ベンチコーチ或总合コーチ，但Head Coach於美国则多半与Manager（总教练、经理）通用，未另行分类。
摘自：http://twbsball.dils.tku.edu.tw/wiki/index.php/%E9%A6%96%E5%B8%AD%E6%95%99%E7%B7%B4

英文维基就有了
The position of bench coach is relatively new in baseball. On most teams, the bench coach is the closest thing a team has to a second-in-command. The bench coach serves as an in-game advisor to the manager, offering situational advice, and bouncing ideas back and forth in order to assist the manager in making game decisions.[3] Should the manager be ejected, suspended, or unable to attend a game for medical or family reasons, the bench coach assumes the position of acting manager or if the manager is fired or resigns, then it is usually the bench who gets promoted to interim manager. The bench coach's responsibilities also include helping to set up the day's practice and stretching routines before a game, as well as coordinating spring training routines and practices.[4]