num.第二十四
Time is sometimes called the fourth dimension. 时间有时被称为第四度空间。
It take twenty minutes for us to go there by bike. 我们骑自行车到那里要花20分钟。
He looks to be a young man of twenty. 他看起来就像一个20岁的青年。
He has been in practice for twenty years. 他已有20年的实践经验。
He's been in tin-pan alley for twenty years. 他二十年来一直演奏流行乐曲。
