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The young do not know enough to be prudent, and therefore they attempt the impossible, and achieve it, generation after generation.
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.
教学的艺术不在于传授本领,而在于激励、唤醒和鼓舞。
"The world is full of magic things, patiently waiting for our senses to grow sharper."