您好，“看大概”在英语中通常表达为“to roughly see/look at/view”或“to get a general idea”。
例如，你可以说：
我只是看大概，所以不能保证细节准确。(I only roughly looked at it, so I can't guarantee the details are accurate.)
她只是看了一眼，并没有详细阅读。(She only roughly looked at it and didn't read it in detail.)
我只是快速看了一眼，并不知道答案。(I only quickly looked at it and don't know the answer.)
希望这些例句对您有帮助！