dollar是不是可數名詞

　　dollar常見句型

　　1.Thirty dollars will be ample for the purpose.

　　有30美元足夠用了。

　　2.HK $ 200 was spent.

　　花了200港幣。

　　3.Was it foolish of him to walk ten miles to return half a dollar he'd overcharged a customer?

　　他跑了十英里路退還給顧客多收的50美分愚蠢嗎?

　　4.The balance on your account is 5 dollars.

　　你的賬上還剩5美元。

　　5.He put the cost at one hundred dollars.

　　他把費用定在100美元。