名词
中文翻译：Unknown
同义词：
['trouble', 'difficulty', 'troublesome', 'perplexing']
例句：
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1. He's in a terrible state of mind right now.
他此刻心情非常糟糕。
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2.The situation is quite difficult for us to solve.
我们很难解决这个问题。
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3. I'm having trouble understanding the concept of time travel.
我很难理解时间旅行的概念。