这个很有用，但有时您还需要生成自己的样本代码。
That's useful, but at times you may also want to generate your own boilerplate code.
假如操作系统和应用程序代码以及常量数据在VMs之间相同，那么这个特点就很有用。
This makes sense, given that operating system and application code and constant data are identical among VMs.
这个图表，看起来很烦，很无趣，但是它很有用，有非常明确的规定，譬如，当你写代码时，就会涉及操作符的优先级。
This chart, very boring and uninteresting but useful to say there are very well defined rules as to when you're writing code, what operators, like what syntax should get evaluated first.
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