Try switching running surfaces (if you've been running on a hard surface, try a softer one or vice versa).
换一种路面去跑步(如果你跑步的路面很硬，就应该试着在软一些的地方跑，反之亦然)。
The flyback converter running in discontinuous conduction mode can be operated in hard switching or quasi resonant (or valley switching, or ZVS) mode regarding the primary side switch.
电感电流断续工作的反激式变换器一次侧开关可工作于硬开关或准谐振(或谷值开关或零电压开关)模式。
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