求翻译：As the head of Pharmacology at my university once said （and I paraphrase）:"I can only research what I do because there are so many who have come before me to whom I can turn for basic knowledge. It is only because of each of the narrowly focused individuals at each step that a full and true understanding of the complexities of life can be had. Each person can only hold enough knowledge to add one small rung to the ladder, but together we can climb to the moon."是什么意思？

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