upstream line
常见例句
- Open the valve on the vent line just upstream the trip valve.
打开速闭阀上游放空管线上的阀门。 - This digitalized optical fiber transmission system is upstream line of the bi-directional optical fiber transmission system.
数字化光纤传输系统，为有线制导光纤传输系统的一个部分； - Butterfly or similar type valves should be installed in the line upstream and downstream of the automatic control valve to allow for maintenance service.
在自动控制阀的上游和下游应该安装蝶阀或类似的阀门，以便于进行维护维修。 返回 upstream line