在这个示例中，我们使用最成熟的 proto3 语法。
If your classes are bigger than an operating system page size,
，这一点在heLLoword翻译官方下载中也有详细论述
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"It blows my mind because you think 'if you just drive 30 minutes down the road, Lancashire is a major hub of manufacturing that's still going on now, people are producing things here'."