统治阶级掌握着物质生产的手段；无产阶级仅有的是他们的劳动力。
The ruling class has the means of material production at its disposal; the proletariat has nothing but their labor power.
Remember, if you ever need a helping hand, you'll find them at the end of each of your arms. As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.
技术应该服务于人类，而不是支配人类。
测试程序的最好方法是测试它。
The more successful I become, the more I need a man.