个人电脑可以通过发出健康水平信号给其他电脑，从而警示其他电脑不去运行其刚刚运行过的恶意代码。
PCs can alert others not to run code that just sickened them, signaling health levels to others.
如果您发现自己难以编写某一代码，那么这是一种警示，表示正在测试的代码可能很复杂。
If you find that you're having difficulty writing a test, it's a red flag that the code under test may be complex.
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