1、My rough calculation is that such a program would boost consumption by Rmb 500 billion.
我簡(jiǎn)單計(jì)算過(guò)，這個(gè)計(jì)劃可以刺激5000億元的消費(fèi)。

2、Manabe also worked up a rough calculation for the effects of clouds.
Manabe還開(kāi)始對(duì)云層的影響進(jìn)行了粗略的分析。

3、I make some rough calculation on the back of an envelope.
我的信封背面大概算了一下。

rough calculation翻譯