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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Cerny said a sealed-tight case could be made with "some fossils of the anatomically modern humans some 100,000 years old found in South Arabia."

赛尔尼认为，要做到严丝合缝，必须“在南部阿拉伯地区找到100,000年前的解破学意义上的现代人类的遗体化石”。

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Tea contains a variety of substances beneficial to human health, but only in dark, sealed case, can be well preserved.

茶叶含多种有利于人体健康的物质，但只有在避光、密封的情况下，才能得以很好地保存。

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Las Vegas Sands denies any contract but lost a fight to keep depositions in the case sealed.

FORBES: Year of the Rat

The keyboard has a waterproof rubber coating and the case is sealed to prevent dust from encroaching.

ECONOMIST: The $100 laptop is fast becoming a reality

The case is sealed, but it involves allegations of illegal kickbacks to doctors.

FORBES: First, Do No Harm