Use a dictionary，give English meanings of the word in bold and then write a sentence.
Finding and keeping the right balance between progress and the protection of cultural sites can be a big challenge.
Definitions
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n.
Sentences

【考點】名詞詞義辨析；動詞詞義辨析．

【答案】hold or carry in equilibrium；equality of distribution；The tightrope walker kept her balance by holding an open umbrella.