只有一個(gè)的用法和樣例：
例句
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只有一個(gè)男孩兒缺席，就是哈里。
Only one boy was absent, namely Harry. -
他只有一個(gè)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(gè)月。
These tickets are available for one month only. -
只有一個(gè)人能做這項工作，那就是你。
Only one person can do the job, namely you. -
只有一個(gè)臥室，所以我們得合著(zhù)用。
There's only one bedroom, so we'll have to share.
