Open vent needle valve and bleed air from hose. Then close vent valve.

开启排气针形阀，并从软管排放空气。然后关闭排气阀。

youdao

Open vent needle valve fully until dripping from vent connection stops.

完全开启排气针形阀直到从排气连接处的滴漏停止为止。

youdao

Since both the HD 555 and HD 595 are designed to be "open" headphones, reducing the vent with this foam would alter the frequency response slightly.

因为HD 555和HD 595都设计为“开放”式耳机，使用泡沫阻挡通风孔会微小的改变频率响应。

youdao

Across the street is the Holloway's Milk Duds factory and every twenty minutes, some vent opens and exhales a cloud of powerful Milk Dud aroma, which wafts in the open windows.

NPR: A Job's Saving Graces: Milk Duds and Doughnuts