一概而论的英文：
[Literal Meaning]
all/aux./judge
to make a judgement by only one standard

[解释]
一概：一律。指处理事情或问题不加区别，用同一标准来对待或处理。

[Explanation]
to treat different matters as the same

[例子]
这是完全两种不同的情况，我们不能一概而论。

[Example]
These are two completely different situations and we should not treat them as the same.

[英文等价词]
lump different matters together

One can't generalise.
不能一概而论。

Of course, we must be careful not to generalise about deer.
当然，我们必须注意不要对所有的鹿一概而论。

This sort of sweeping generalization may have been acceptable in the 1930 's.
这样的一概而论在30年代也许可以接受。

I don't think you can generalize about that.
我认为对那事你不能一概而论。