PROFESSOR2: So it's not really a Boolean-valued function.
教授2：因此这并不是一个，真正的布尔值的函数。
Standard Boolean operators are available, such as and, or, xor and not.
可以使用标准的布尔操作符，比如and、or、xor和not。
However, the data of stock is not Boolean but series.
股票数据是连续的数值型数据，而不是逻辑型的。
However, the data of stock is not Boolean but series.
股票数据是连续的数值型数据，而不是逻辑型的。
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