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DNA的结构是一个需要解决的谜题。
The structure of DNA was a puzzle that demanded to be solved.
Seeing, hearing, and remembering are all acts of construction.
选自汉·桓宽《盐铁论·散不足》。这句话以积土成山、列树成林为喻,说明积少成多、打好基础的重要性。