两个或多个系统，每个系统的负载不超过总负载的50%。
Two or more systems loaded with no more than 50 percent of the total load.
两个或多个资源实例，每个实例的负载不超过总负载的50%。
Two or more resource instances loaded with no more than 50 percent of the total load.
据估计，如果桥上挤满汽车，也仍然只有它总负载能力的三分之一。
It has been estimated that if the bridge were packed with cars, it would still only be carrying a third of its total capacity.
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