The S&P 500 is 500 companies, who are major companies, so these tend to be mature companies and they tend to be in the dividend-paying stage.
标准普尔500指数包括500家大公司,这些一般都是成熟期的公司,他们一般都处于需要支付股利的阶段
Include our library, include the standard library.
包括我们自己的库,包括标准输入输出库。
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