From upstream to downstream, to go to, have no a propeller, without losing tracing the swim fins, ability, we can not return in the past.
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4. 所述设备包括：接收模块、第一回溯模块、校验模块、分叉位置获得模块和第二回溯模块。
The device comprises a receiving module, a first backtracking module, a verification module, a bifurcation position acquisition module and a second backtracking module.
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5. 所述设备包括：接收模块、第一回溯模块、校验模块、分叉位置获得模块和第二回溯模块。
The device comprises a receiving module, a first backtracking module, a verification module, a bifurcation position acquisition module and a second backtracking module.
