始终把生态文明建设作为重大政治任务和底线任务，建立祁连山国家级自然保护区生态保护、黄河流域生态保护和高质量发展、荒漠化综合防治“三大机制”，深入实施“三北”工程，全力打好“七大标志性战役”，坚决筑牢国家西部生态安全屏障。
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。Line官方版本下载对此有专业解读
The toString method that gets called depends on the type of the receiver object. This isn’t determined at compile time, but instead a lookup that happens at runtime. The compiler effectively generates a switch statement that looks at the result of getClass and then calls the right method. It’s smarter than that for performance I’m sure, but conceptually that’s what it’s doing.
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