Students in fifty schools are to act as guinea pigs for these new teaching methods.

　　五十所學校的學生將作為這些新教學法的試驗對象。

　　The ceremony was transmitted live by satellite to over fifty countries.

　　典禮通過衛星向五十多個國家進行了實況轉播。

　　Fifty pounds is the best I can offer you.

　　我頂多出五十英鎊。

　　I'd say he was about fifty.

　　我猜他五十歲上下。

　　Roughly speaking, we receive about fifty letters a week on the subject.

　　關于這個問題，粗略地說，我們每周能收到大約五十封來信。