fifty
Her looks belie her 50 years.
她的容貌掩饰着她的50岁年龄。
She drove at a steady 50 mph.
她以每小时50英里的稳定速度驾驶。
We´ve come 50 miles this morning.
我们今天上午走了50英里。
Blake already owed him nearly $50.
布莱克已经欠了他近$50。
The tank takes 50 litres.
这罐能容50升。