The beautiful Bird's Nest consumed 42, 000 metric tons of steel (roughly 500 kilograms per square meter).
漂亮的鸟巢消耗了4万2千吨钢(约莫每平方米500公斤钢材)。
A metric unit of length equal to one thousandth of a meter.
公制长度单位等于千分之一米。
The metric system is the measuring system based on the meter for length, the gram for weight and the liter for capacity, which counts by tens.
公制是基于以米为长度单位，克为重量单位，公升为容积单位的测量系统，它们都是十进位。
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