只有一個的用法和樣例：
例句
-
只有一個男孩兒缺席，就是哈里。
Only one boy was absent, namely Harry. -
他只有一個心思--想的都是性事！
He's got a one-track mind -- all he ever thinks about is sex! -
這些票的有效期只有一個月。
These tickets are available for one month only. -
只有一個人能做這項工作，那就是你。
Only one person can do the job, namely you. -
只有一個卧室，所以我們得合著用。
There's only one bedroom, so we'll have to share.
