2. An umpire stands behind the catcher in baseball. �������ʱ������Ավ�ڽ����ֵ�����
3. When the umpire says you are out, it is useless to argue because his decision is irrevocable. ���������������ʱ���������������ģ���Ϊ���еľ����Dz��ܸ��ĵġ�
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n.
1. an official at a baseball game
2. be a referee or umpire in a sports competition