通过备用电容器投切的滞环控制律的设计，以减少电容器组的投切次数。
Hysteresis control is designed for standby capacitor to reduce its switching times.
1991年，当那第一颗绿苹果树遭受蜜环菌的危害时，它的栽培者确定他们需要一个备用计划。
In 1991, when the tree was suffering from a bout of honey fungus, the growers decided they needed a back-up plan.
我的朋友吉姆和依娃林退休后，开始用他们的家庭式旅行车进行环美旅行。 他们在旅行车后面还施着一辆小桥车备用。
After retirement, our friends Jim and Evelyn began traveling around the United States in a motor home, towing their compact sedan behind.
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