387. The cost of the electricity plus the cost of your time could well make your hairdryer the most expensive one of all.

译文

电费加上你的时间花费很可能让你的吹风机成为最贵的一个。

点睛

plus意为“加上；和”。如：
The bill was $20, plus $5 for postage. 账款是20美元，外加5美元的邮费。
They've got to fit four people plus all their luggage in the car. 他们得在汽车里挤下四个人和全部行李。
well此处意为“有理由地，合理地，可能地”，用于can, could, may, might等情态动词之后。如：
You may well be right. 很可能你是对的。
I can't very well leave now. 我现在离开不太合适。
most...of all意为“所有之中最……”，其中of all限定比较的范围。如：
This cell phone is the most affordable of all for me. 对于我来说，这款手机是我最能负担得起的。