Students in fifty schools are to act as guinea pigs for these new teaching methods.
五十所学校的学生将作为这些新教学法的试验对象。
The ceremony was transmitted live by satellite to over fifty countries.
典礼通过卫星向五十多个国家进行了实况转播。
Fifty pounds is the best I can offer you.
我顶多出五十英镑。
I'd say he was about fifty.
我猜他五十岁上下。
Roughly speaking, we receive about fifty letters a week on the subject.
关于这个问题，粗略地说，我们每周能收到大约五十封来信。