cost是可数名词吗

How much does it cost to become a member?

要成为会员得花多少钱？

It's time we got on to the question of costs.

我们该讨论成本问题了。

A new computer system has been installed at a cost of 80 000.

新的计算机系统已安装，费用为8万英镑。

That one mistake has cost him dear over the years.

那一个差错使他多年来付出了沉重的代价。

Cost was a key element in our decision.

价钱是我们决策时考虑的主要因素。