西方人一年平均产生超过500公斤城市垃圾，这只是世界上最富裕的地方丢弃的可以统计的垃圾重量。
The average Westerner produces over 500kg of municipal waste a year—and that is only the most obvious portion of the rich world’s discards.
当前的金矿物统计工作大多局限于颗粒数百分比计算，而且常常把粒数比简单地等同于重量比，这在理论上和实践上均是错误的。
The current statistics of gold minerals is confined to the calculation of percent of grains, which is a mistake in theory and practice.
他们统计这些动物打哈欠的时长，然后将其与各物种的大脑平均重量以及大脑皮层神经元的数量进行比较。
They timed all those yawns -and then compared them to each species' average brain weight, and the number of neurons in the cerebral cortex.
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