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既能与金属钠反应，又能与氢氧化钠反应，还能与碳酸钠反应的是
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Language contains two subsystems: sounds and meanings.()
They would rather work than rest.()
When linguists write grammars or lexicographers compile dictionaries they must use metalanguage.()
Although an Olympic medal loses its luster after years of storage, a hero never loses
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