Everyone is in favor of free speech. Hardly a day passes without its being extolled， but some people's idea of it is that they are free to say what they like， but if anyone else says anything back， that is an outrage.

The least I can do is speak out for those who cannot speak for themselves.

The only way to learn mathematics is to do mathematics.

生活如果不搞笑的话那将成为一幕杯具。