If someone asks me the price, I might give a ballpark figure or a ballpark estimate.

如果有人问价格，我会给出a ballpark figure(大约的数字)或ballpark estimate(大概的估计)。

Another common expression is a ballpark estimate.

另一个常见的表达方式是粗略估计。

A ballpark estimate, however, is a term that means a rough estimate - an approximate guess at something.

然而，粗略估计是一个术语， 意思是粗略估计 - 对某事的近似猜测。