极其严重的
5.In this special situation, our change in strategy was an extremely serious one.
7.For extremely severe or prolonged attacks, palliative operations on sensory nerves, roots or their central connections have been resorted to with differing success.
8.Jane wrote a letter to a newspaper. This letter contained some startling allegations.
9.Admittedly,the contamination of environment is the serious problem,the authorities should be take powerful measure to ravel out it.
10.There is no doubt that environmental pollution is a serious problem, and the goverment should take some reclamation activities with it.


