Given the following dataframe. How can I change all hab type to "ungrazed" where Study area is equal to "B". It seems I would need to use an apply function, but I can't seem to unravel the correct construction. Thanks in advance.Given the following dataframe. How can I change
阅读背景：
更改一列中数据框中的值，其中某些其他列等于某些文本。
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