用一个O形环密封安全阀阀体与主外壳。

An O-ring seals the relief valve body to the main housing.

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只有这种新装置才具有密封防水的外壳。

Only the new device is housed in sealed water proof case .

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只有这种新装置才具有密封防水的外壳。

Only the new device is housed in sealed water proof case.

youdao

只有这种新装置才具有密封防水的外壳。

Only the new device is housed in sealed water proof case.

youdao