数算练习告诉我们算术运算的原理,而不是单单的记忆和不断演算。
"Home is not where you are from, it is where you belong."
The essence of science is not to complicate the simple, but to simplify the complex.
It is easier to change the specification to fit the program than vice versa.
The mining industry must lead by example in safety, sustainability and social responsibility.