I did a back-of-the-envelope calculation for our spending on gyms and fitness equipment over the past 27 years.
我粗略地计算了一下过去27年来我们在健身会员卡和健身器械上的花费。
A back-of-the envelope calculation suggests China may have accounted for as much as 2 percentage points of annualised growth in inflation-adjusted world output in the second quarter of 2009.
根据粗略计算，2009年第二季度，中国可能为经通胀调整、折合成年率计算的全球产出增幅贡献了高达两个百分点。
I worked this out with Martin Wattenberg at IBM; it's a back-of-the-envelope calculation, but it's the right order of magnitude, about 100 million hours of thought.
这是我和马丁•瓦滕伯格在IBM计算出来的。这是一个封底计算，但它的数量级是正确的，约1亿小时的思想。
"Just a back-of-the-envelope calculation shows that in the Philippines, if we in a year can be reaching just five thousand farmers and their fields can be increasing the yield by half a ton per hectare, we could be looking at profitabilities for those farmers in the range of half a million dollars."
VOA: standard.2010.07.28
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