Buchholz relays have a test port to allow the accumulated gas to be withdrawn for testing.

布赫继电器有一个测试口，测试时聚集的气体可以从此口散出。

The on-the-spot application showed that it is very effective for pulse ventilation in prevention and control of accumulated gas at the upper corner angle of coal face.

现场应用结果表明，射流脉冲通风对治理上隅角瓦斯积聚具有良好的效果。

Almost all of the global supply of helium is located within 250 miles of Amarillo, Texas; it's distilled from accumulated natural gas and extracted during the refining process.

几乎全部所有的氦都由德克萨斯州阿马里洛市方圆250英里的地区供应；它是通过从积聚的天然气中蒸馏并在精炼中萃取而来的。