Buffett's donations will come in the form of ClassB shares of Berkshire Hathaway stock.
巴菲特的捐款将以伯克希尔·哈撒韦公司B级股股票的形式进行。
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It's not a low-priced stock--a single share of its ClassBstock costs more than $3, 500--but it has averaged a 25 percent return over the past quarter century.