upstream line
常见例句
- Open the valve on the vent line just upstream the trip valve.
打開速閉閥上遊放空琯線上的閥門。 - This digitalized optical fiber transmission system is upstream line of the bi-directional optical fiber transmission system.
數字化光纖傳輸系統，爲有線制導光纖傳輸系統的一個部分； - Butterfly or similar type valves should be installed in the line upstream and downstream of the automatic control valve to allow for maintenance service.
在自動控制閥的上遊和下遊應該安裝蝶閥或類似的閥門，以便於進行維護維脩。 返回 upstream line