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。
Conferences like the Earth Summit help people understand that there exist serious problems and that there is still time to take action.
像地球峰会这样的会议帮助人们了解还存在着严重的问题及还需要时间来采取行动。
Conclusion There exist serious psychological problems in patients before and after renal surgery.
结论肾移植手术前后受者存在严重的心理问题。
There exist a lot of serious problems on the planet that we live on___ the earth , such as floods , droughts , landslides, dust-storms and so on .
我们居住的这个行星——地球上，存在着许多严重的问题比如说：洪灾、旱灾、泥石流和沙尘暴等等。
There exist many serious problems in exploitation and utilization of the water resources.
水资源开发利用中存在许多亟待解决的问题。
There exist many serious problems in exploitation and utilization of the water resources.
水资源开发利用中存在许多亟待解决的问题。
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