英语语法分析

The 30 percent figure may be no more than a guesstimate.

30%这一数字可能只是个大约的估计。

《柯林斯英汉双解大词典》

Can you give a guesstimate of how much it will cost to fix my car?

你能估计出修理我的车要花多少钱吗？

So supposed that this one — I'll just guesstimate, this one feels heavier.

假设是这个——我只是瞎猜，这个貌似重一些。