Her overwhelmed mother pretends everything is normal, and the family refuses to face the problem.

VOA: standard.2010.07.22

You can see that it would be problem here if the gene that you were trying to give to the cancer cells also went to normal cells-- that would be a problem.

这确实是个问题,如果我们想导入癌细胞的自杀基因,也能进入正常细胞,那问题就大了

耶鲁公开课 - 生物医学工程探索课程节选

Your normal work day is problem solving.

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Chris Sampson from Transport and Technical Services said rain and snow had made the problem worse than normal.

BBC: Wet weather causes a rise in landslips in Jersey

The main problem I see for normal people is the upfront cost and the selection of movies.

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