Chain of command : the flow of authority from the top to the bottom of an organization.

指挥链：组织中权力从上级到下级的流动路径。

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Plankton is at the bottom of the Marine food chain.

浮游生物处于海洋食物链的最底层。

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Plankton is at the bottom of the Marine food chain.

浮游生物处于海洋食物链的最底层。

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