guestimate

1. Its not easy for us to estimate or take into account demand, coupled with the production limitations it makes its a guestimate at times.
   我们很难预估需求，加上产能的限制，有时候只能粗略估算。
2. We should hold the idea that we must guestimate the subjects that we actually don't know.
   汤姆考试没过，因为他真的不知道答案，于是他只好推测所有题目。
3. Tom failed the exam because he didn't really know the answers so he had to guestimate everything.
   汤姆考试没及格，因为他不知道答案，所以全都瞎猜了。

noun

1. an estimate that combines reasoning with guessing

   Synonym:    guesstimate