关键词：英语、考研、题目、答案
题目：请根据以下语境，完成句子填空。
As we all know, the English language is known for its rich vocabulary. This is especially true in academic writing, where precise word choice is crucial. For instance, instead of using a simple word, you can often find a more sophisticated and appropriate term that enhances the quality of your work. In the context of a research paper, the term "___" could be a better choice than "factor."
答案：variable
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