名词
中文翻译：难词
同义词：
['unfamiliar words', 'difficult words']
例句：
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1.I'm having trouble understanding the meaning of this hard word.
我很难理解这个难词的意思。
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2.We need to learn more difficult words to improve our vocabulary.
我们需要学习更多的难词来提高我们的词汇量。
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3. The teacher asked us to use hard words in our writing to make it more interesting.
老师要求我们在写作中使用难词，使文章更有趣。