We use machine classes you should have declared in the control: section, under AddInstallable().

我们使用您应该已经在 AddInstallable() 下的 control: 节中声明的机器类。

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For example, such rules would allow us to determine that it is incorrect to connect two UML classes by a state machine transition.

例如，这种规则将允许我们去测定通过一个状态机转换来连接两个UM L类是不正确的。

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Some objects and classes may not be cleaned up because they assume that once the program exits, the virtual machine will exit too, and everything will be cleaned up automatically.

它们可能不去清除一些对象和类，因为它们假定当程序存在时，虚拟机也存在，所有对象和类都将被自动清除。

youdao

Even more fundamentally, the digital economy's infrastructure has advanced basic material science and classes of machine tools that have led directly to the new high-power electronics (enabling hybrids) and to big, cheap flat-panel, thin-film PVs (derived from the massive thin-film machines that make flat-panel-TVs).

FORBES: Bubble Energy?

That's a mouthful. (Laughter.) Machine shops and automotive mechanics were some of the first classes you could take.

WHITEHOUSE: Education, Innovation & The Economy