之间没什么特别的，R中的任何其他函数都会导致相同的问题。您的困惑源于dplyr具有许多功能，这些功能使您可以像对待普通变量一样处理data.frame列名；例如：

between is nothing special — any other function in R would have led to the same problem. Your confusion stems from the fact that dplyr has a lot of functions that allow you to work on data.frame column names as if they were normal variables; for instance:

filter(flights, month > 9)

但是， 之间不是这些功能之一。如上所述，这只是正常功能。因此，如果要使用它，则需要以常规方式提供参数。例如：

However, between is not one of these functions. As mentioned, it’s simply a normal function. So if you want to use it, you need to provide arguments in the conventional way; for instance:

between(flights$month, 7, 9)

这将返回逻辑向量，您现在可以使用它来索引您的数据。

This will return a logical vector, and you can now use it to index your data.frame:

flights[between(flights$month, 7, 9), ]

或更像是dplyr：

flights %>% filter(between(month, 7, 9))

请注意，我们现在在此处使用非标准评估。但是评估是由过滤器执行的，而不是由之间的$code>执行的。使用标准评估调用之间的（通过过滤器）。

Note that here we now use non-standard evaluation. But the evaluation is performed by filter, not by between. between is called (by filter) using standard evaluation.