Most boundaries are obvious: network connections, process-to-process communication, file systems, operating system interfaces, and so on, but some boundaries are more subtle.

大多数边界是很明显的：网络连接、进程与进程的通信、文件系统、操作系统接口等等，但是有些边界就不好辨别。

youdao

A second, more subtle reason is that the model, not the diagrams, becomes the expression of record for the structure, semantics, and behavior of the system.

其次，更细微的原因是模型，不是图，成为系统的结构、语义和行为的记录的表示。

youdao

The system monitors subtle changes in seven streams of real-time data, such as respiration, heart rate and blood pressure.

系统监测七组实时数据流的细微变化，比如呼吸、心率和血压。

youdao

There is also a more subtle defence of the American political system: the hazing defence.

ECONOMIST: A hard day’s night | The

The clean and well-spaced control strip above the keyboard and the subtle blue LEDs emanating from the system save the Valkyrie from being flat-out ugly.

FORBES: iBuyPower Valkyrie Gaming Notebook Review: Budget Price, Amazing Performance

Unfortunately, traditional endpoint security techniques are not designed to understand the logic behind these attacks the clandestine activity occurring within system processes, those subtle changes necessary to spot potentially bad behavior.

FORBES: To Stop Cybercrime: Understand Crime Logic, And Adapt