American firms used to be allowed to amortise goodwill over many years.

过去美国的企业被允许将商誉在很多年内逐。

This might not matter to a sophisticated economist, who would amortise the battery cost over the life of the vehicle.

这也许不会令些顽固老练的家感冒，因为他们懂得把电池的成本分到汽车的寿命上。