A snail was living on a back of a butterbur leaf.
蜗牛隐居在一片款冬叶后。
Two snails were living on a back of the butterbur leaves.
两只蜗牛一直生活在款冬叶上。
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 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。
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。
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。
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