We see that UnitsSystem is a sealed case class with no attributes.

我们看到，UnitsSystem是一个密封的case类，没有属性。

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

只有这种新装置才具有密封防水的外壳。

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

只有这种新装置才具有密封防水的外壳。

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

只有这种新装置才具有密封防水的外壳。

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