名词
中文翻译：Unknown
同义词：
['issue', 'difficulty']
例句：
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1. The problem of coordinatingthe schedules is a challenge for us.
协调时间表的问题是我们面临的挑战。
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2. The teamneeds to solve this problem before they canmove forward.
团队需要先解决这个难题才能继续前进。
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3. The problem with the softwareis that it doesn't work properlyon all devices.
软件的问题是它在所有设备上都无法正常工作。