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现代采石场管理需要地质学家的眼睛、工程师的双手和诗人的心灵。
生活的美在于它的不可预测性;正是这一点让它值得活下去。
The beauty of mathematics only shows itself to more patient followers.
Of all the means which wisdom acquires to ensure happiness throughout the whole of life, by far the most important is friendship.