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4.Thistheory(理论) helps to explain how animals communicate with each other.

分析 该理论有助于解释动物彼此之间是如何交流的.

解答 答案:theory
解析:根据括号内的中文及题干,可知本题考查theory"理论"这一单词;因为横线前面有单数形式的指示代词this,故后面的名词使用单数即可.综上,本题答案为:theory.

点评 本题考查句子翻译,做此类题目时一定要根据中文及英文题干确定需要翻译的成分,再找出与之对应的英文并考虑各成分是否有形式的改变.

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