... 用座式压缩式水银真空计在泵口测量。With a Mcleod gauge 气镇开With gas ballast 极限全压强Ultimate total pressure Pa ...
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with gas ballast
带气体镇流器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Unlike a conventional hot air balloon where the height is controlled by a burner, the gas balloons are filled with hydrogen and controlled by releasing gas to go down and throwing out ballast to go up.
BBC: Wiltshire
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