肉类加工行业有责任为消费者提供安全、高质量的产品。
当一种程序语言的程序需要引起注意时,它是低级的。
If you can't explain your chemistry to a non-scientist, you don't understand it well enough.
学习数学的唯一方法就是做数学。
With great power comes the need for great caution.