Fire proof vaults and toxic gas venting systems are not required.

防火地窖和有毒气体的排气系统是不是必需的。

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The incoming gas delivery system and exhaust gas venting system are likewise protected by various methods.

输入气体传送系统和排气排放系统同样也通过各种方法而受到保护。

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Gravity ball check may be converted for air or gas venting by replacement of standard ball with floater PP ball.

通过用漂浮的PP球更换标准球，重力球形止回阀可以改造为适用于空气或气体排气口。

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The IEA estimates that shale-gas production emits 3.5% more than conventional gas, and 12% when it involves venting excess gas.

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The most recent reports this evening indicate that venting of gas is imminent.

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The new system also includes enhanced venting of smoke and gas from inside the battery to outside the plane.

NPR: FAA Approves Resumption Of Boeing 787 Flights