每单位重量的绳索长度 yardage
当今发达国家没那么易受影响是因为每单位产量的石油消耗量已大大减少。
The rich world is less vulnerable now because it has substantially reduced the amount of oil used per unit of output.
天然气的二氧化碳产生量是每单位煤炭释放能量时二氧化碳产生量的一半。
Gas emits about half as much carbon dioxide as coal per unit of energy produced.
每单位的酒有8 G酒精，大概相当于半杯标准的葡萄酒，半品啤酒或是一个酒吧的酒精量。
One unit is 8g of alcohol, roughly equivalent to half a standard glass of wine, half a pint of beer or a pub measure of spirits.
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