知识好像地下的泉水，掘得越深越清澈。
Knowledge is like the spring water underground — the deeper you dig, the clearer is the water.
知识好象沙石下面的泉水，掘得越深越清澈！
The knowledge resembles the grit following water seepage, digs deeply more limpid!
知识好像砂石下的泉水，掘得越深，泉水越清。
Knowledge like springs under the sand, to dig the deeper, spring more clearly.
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