Cathy did a rough calculation.

凯茜作了一个粗略的计算。

《牛津词典》

I make some rough calculation in the back of an envelope.

我在信封的背面做了一个粗略的估算。

youdao

From rough calculation, we can see that we have no profit.

粗略计算后可以看出我们无利可图。

youdao

From rough calculation, we can see that we have no profit.

粗略计算后可以看出我们无利可图。

youdao