one day:(过去或将来)某一天
He tricked me this time but I'll get back at him one day.
这次他欺骗了我,但总有一天我会报复他的.
It's impossible for us to finish the work in one day.
我们在一天之内完成这份工作是不可能的.
One day we'll both get to see New York.
总有一天我俩都有机会看看纽约.