Many small contributions or efforts can accumulate to achieve a significant result; many a little makes a mickle.
我们每个人都捐出一点旧书，众毛攒裘，就能为山区学校的孩子们建立一个小型图书馆。
If each of us donates a few old books, many small contributions can accumulate to help build a small library for the children in mountain schools.
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