不同高度源应以低架源污染控制为主。

Especially low source pollution should be controlled.

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F - 5是一架灵活、高度可控、可靠的超音速战斗机，它结合了先进的气动设计、发动机性能和低运营成本。

The F-5 is an agile, highly maneuverable, reliable supersonic fighter, combining advanced aerodynamic design, engine performance and low operating costs.

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该转向架具有维修费用及线路使用费用低，货运效率更高、更经济、更安全的优点。

These bogies have such advantages as low maintenance cost and track utilization cost, higher transport efficiency, more economic and safe.

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