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学习数学的唯一方法就是做数学。
The only way to learn mathematics is to do mathematics.
The truth is always something that is told, not something that is known.
Believe in yourself and all that you are. Know that there is something inside you that is greater than any obstacle.
在石油和天然气行业,技术是提高效率和减少环境影响的关键。
The fabulous country—the place where miracles not only happen, but where they happen all the time.
Gain weight and stay well.