What worries me the most is...最让我担心的是...
What worries me the most is the possibility of complete failure.
最让我担心的是可能会彻底失败.

I think the point is...我觉得关键在于...
The point is you shouldn't have to wait so long to see a doctor. 关键是看病不该等那么长时间.

来源:恒星英语-口语频道
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