cost是可數名詞嗎

　　How much does it cost to become a member?

　　要成為會員得花多少錢？

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

　　我們該討論成本問題了。

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

　　新的計算機系統已安裝，費用為8萬英鎊。

　　That one mistake has cost him dear over the years.

　　那一個差錯使他多年來付出了沉重的代價。

　　Cost was a key element in our decision.

　　價錢是我們決策時考慮的主要因素。