What do you mean by alternate? What do you mean by alternating?

1, Alternate: clear system. After the official department selects the unfilled officials, the official department will submit a list of officials for allocation, and draw lots once a month according to their positions, qualifications and shifts, and allocate them to a certain department or province for use by the Committee, which is called alternate. But you can also pay money to designate a place freely without drawing lots, which is called saving or scoring.

2. In ancient times, when the official department obtained the candidate qualification, it would compile a list of petition distribution officers, and draw lots once a month according to their positions, qualifications and shifts, and assign them to a certain department or province for use by the Committee, which is called standby. If you want to avoid drawing lots, you must appoint an alternate to a certain place by yourself, and you must pay the money separately. This is called saving or scoring.