名词
中文翻译：困难
同义词：
['misfortune', 'adversity', 'difficulty']
例句：
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1. Life is full of unexpected challenges and setbacks.
生活充满了意想不到的挑战和挫折。
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2. The project encountered many unforeseen difficulties during the implementation phase.
该项目在实施阶段遇到了许多预料之外的困难。
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3. Despite the setbacks, we persevered and eventually succeeded.
尽管遇到了挫折，但我们坚持不懈，最终取得了成功。