形容词
中文翻译：困难的
同义词：
['tricky', 'tough', "hard例句：1. It's difficult to find a parking spot in the city center.（在市中心找到一个停车位很难。）"]
例句：
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1. It's difficult to find a parking spot in the city center.
在市中心找到一个停车位很难。
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2. The project is difficult because it requires a lot of technical expertise.
这个项目很难，因为它需要很多专业技术。
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3. I found it difficult to concentrate on the lecture due to distractions.
由于分心，我发现很难集中注意力听讲座。