I should say

汉语翻译

(作插入语)我想, 大概

例句

It's a long shot, but I should say she's about forty.这不好猜，但我猜她大约是四十岁左右。I should say a few words (by way) of explanation.我应当说几句解释的话。That, I should say, is true.那大概是事实吧。I should say so.我想是这样的。