paper money是可數名詞嗎

　　Gold was heavy and cumbersome compared with paper money.

　　因為黃金和紙質貨幣比起來又笨又重。

　　Paper money is an ancient technology and an inconvenient means of payment.

　　紙鈔是一種古老的技術，也是一種麻煩的的支付手段。

　　Some Banks, however, did not have enough gold to support all the paper money they offered.

　　然而，一些銀行沒有足夠的黃金儲備來支持他們所發行的貨幣。