节选自《看不见的城市》（Italo Calvino）
马可-波罗讲一条桥，描述它的每一块石头。
“可是，支住桥的是哪一块石头？”忽必烈可汗问。
“支住桥的不是任何一块石头，”马可回答，“而是石块形成的桥拱。”
忽必烈可汗默默想了一会，又问：“你何必讲石头呢？我只关心桥拱。”
波罗回答：“没有石头就没有桥拱了。”
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