This particular grammar in Chinese is not like English which you say things like "a piece of bread, a bottle of champagne" only when some particular cases or necessary situations. In Chinese language, we say like “a something of something” all the time. For example, you can not say “一猫 a cat”，you should say “一只猫(like a 只 of cat)”.
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Has difficulty understanding even short answers in this language.
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