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。
This whole area is sealed off in case the man get away.
这一整个区域都封锁起来了，以免这个男人逃跑。
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。
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。
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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