饥饿天使是一个隐喻,饥饿如影随形地跟踪着你。
检验统计假设的问题由来已久,其起源已不可考。
It is India that gave us the ingenious method of expressing all numbers by means of ten symbols, each symbol receiving a value of position as well as an absolute value.
我不是来讨人喜欢的,我是来真实的。