从源元素到目标元素，控制只需要流动一次。
Control only needs to flow once from a source element to a target element.
银行并不是流动性的唯一来源。
减少压力过剩可采用负载感应，旁路节流和恒流动力源实现。
That can be realized by load sensing, bypass throttling and power source of constant flow.
燃料电池客车采用多动力源的动力系统结构，需对其能量流动进行有效的控制。
For Fuel Cell Bus with multi-power sources configuration, energy flow must be efficiently controlled.
燃料电池客车采用多动力源的动力系统结构，需对其能量流动进行有效的控制。
For Fuel Cell Bus with multi-power sources configuration, energy flow must be efficiently controlled.
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