What are the dual WAN modes of the Xiaomi routers?

Some routers with dual WAN settings have introduced three modes: Bandwidth aggregation, WAN1 priority with WAN2 backup, and WAN2 priority with WAN1 backup.
For your reference, here are the explanations of these three modes:
1. Bandwidth aggregation refers to aggregating the bandwidth of WAN1 and WAN2 to achieve a combined WAN bandwidth. For example, if the bandwidth aggregation mode is selected, with WAN1 at 1000M and WAN2 at 1000M, the theoretical combined speed would be 2000M;
2. WAN1 priority with WAN2 backup: In backup mode, WAN1 is prioritized as the main WAN port, while WAN2 serves as the backup. If WAN1 is disconnected, WAN2 can maintain the external connection if it is still operational. The backup mode does not combine bandwidth;
3. WAN2 priority with WAN1 backup: In backup mode, WAN2 is prioritized as the main WAN port, while WAN1 serves as the backup. If WAN2 is disconnected, WAN1 can maintain the external connection if it is still operational. The backup mode does not combine bandwidth.
For example, if WAN1 is 1000M and WAN2 is 1000M, selecting WAN1 priority with WAN2 backup will still result in a total speed of 1000M.