单语范例（未经PONS编辑处理）
英语
- A non-return system must be fitted, to prevent water from the tanks being drawn into the cylinders when the steam is shut off.en.wikipedia.org
- The system comprises a non-return valve device, and a pusher with a stylet and two ports.en.wikipedia.org
- One has a non-return valve and is the connection for the air line.en.wikipedia.org
- This is an assessment of the efficiency of non-return valves designed to prevent the armbands from deflating suddenly if an inflation valve comes open.en.wikipedia.org
- The vacuum is transferred to the servo along semi-rigid plastic lines, and is stored in the servo by using a non-return valve.en.wikipedia.org
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