Propagation can also happen in different directions: horizontal or downstream.

传播还可能发生在不同的方向上：水平的或者下游。

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A device incorporating an orifice that is used to control fluid flow rate or downstream system pressure.

包括一个喷嘴的装置。它用于控制流体的流量或下游系统的压力。

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Once the token is generated, it is maintained and propagated for all subsequent calls, either horizontal or downstream.

在生成了令牌之后，按照水平或者下游的方向，为所有后续的调用对令牌进行维护和传播。

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Some specialize in upstream (gathering and production) or downstream (refining and marketing) operations.

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Targeting other parts of the same biological pathway, upstream or downstream of the receptor, could also suggest new treatment options.

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By using this correlation criterion, the Fund provides exposure to pure-play oil companies with significant oil reserves that are not as involved in other industries such as natural gas or downstream operations.

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