They could be sources of additional waste.
它可能是其他一些无效率活动的来源。
So requesting additional resources is a waste in a traditional situation.
因此在传统情况下请求附加资源是一种浪费。
But he says his group provides additional learning materials about health and water and waste systems.
他的组织提供有关健康、水和废物处理这些额外的学习材料。
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