念音	〔R21〕  Why is a crane like a well-known shell fish? 〔译注〕 为何起重机像一种有名的贝壳鱼？ 注： crane 可指「鹤」或「起重机」。 〔提问〕 If the answer is “because it's an _____,” what is the right word to fill in? 〔谜底〕 h______
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