It is also easy to overlook the productivity that inventories provide in smoothing out interruptions in the flow of materials and output through the stages of production and distribution.
存货在生产和分配的各环节中能缓和物资和产出的流量中断问题，从而提供生产力，这点也很容易被忽略。
This is a basic subject in ecology that seeks to improve the understanding of the flow of energy and materials through ecosystems and the regulation of the distribution and abundance of organisms.
本课程着眼于生态学之基础课题，探讨生态系中之能量流动与物质流动，及外在与内在因子对生物体分布和数量之控制。
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