Economists call it " deadweight loss" and they estimate that up to 30% of the value of all gifts is wasted.

经济学家称之为“无”，们估所有礼物中有高达30%价值被浪费了。

Economists call this " deadweight loss" and they estimate that up to 30% of the value of all gifts is wasted.

经济学家称之为" 无" ，们估所有礼物中有高达30%价值被浪费了。

The missing 10% is what economists call a deadweight loss: a waste of resources that could be averted without making anyone worse off.

这中间10%差别就是经济学家们所“额外”：这种资源浪费可以在不使任何人钱情况下得以避免。

To him this plane is nothing but a giant tube-full of anonymous deadweight, supported in the air by a handful of sparking plugs, and guided to its destination by a scrap of electricity.

对来说，这架飞机只不过是一个巨大管子， 里面装满了无名自重，由一把火花塞支撑在空中，并由一点电力引导到目地。