下面这些话怎么翻译？

1、DR comparison between recovery deaf children and normal children
2、making DR test for 30 recovery deaf children and 30 normal children respectively, then doing relative statistic analysis.
3、complete the experiment and then make statistic comparision
4、There are distinct differences existing between recovery deaf children and normal children.

1st, is restored to health the deaf child and the normal child DR comparison
2nd, to is restored to health separately the deaf child and normal child each 30 carries on the DR survey, and makes the related data statistics and the analysis.
3rd, completes the experiment, has carried on the data comparison.
4th, is restored to health the deaf child and normal child DR has the remarkable difference.