为降低开关频率和减少开关损失，需增加功率滞环比较器环宽，否则引起瞬时有功功率和直流电压波动，影响系统的性能；
The hysteresis wide is widened for decreasing switching frequency and energy losses, which causes the pulsation of instantaneous active power and direct current voltage.
虽然串联喷嘴阻力损失的增加，使射流平均能量有所降低，但射流的瞬时能量得到了调制，激励出更大的流体振荡。
Although the resistance force increase of series nozzles makes the average energy of jet flow decreased but it lets the instantaneous energy modulated to impel more fluid resonances.
预应力筋的预加应力并不是常量，而是瞬时或随时间增长而逐渐减小，预应力筋这种预加应力减少的现象称为预应力损失。
The prestress of prestressed reinforcement is not constant, but gradually reduces with time growth. This reduction of prestress is called prestress loss.
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