... 尚存在的问题与困难 Existing challenges 云的观测中存在的问题 Problems on observing clouds 存在严重的问题 there exist serious problems ...
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With students' increasing activities online, there exist serious problems in network morals.
随着大学生上网活动日益频繁，网络道德问题愈加突出。
Conferences like the Earth Summit help people understand that there exist serious problems and there is still time to take action.
像全球峰会这样的会议帮助人们了解还存在严重的问题，还有时间去采取行动。
Conferences like the Earth Summit help people understand that there exist serious problems and that there is still time to take action.
诸如地球峰会这样的会议，帮助人们了解存在的严重的问题，现在仍有时间来采取行动。
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