翻译下列词组。

1、40名学生                                                                 

2、108元钱                                                                   

3、17本语文书                                                              

4、三块橡皮                                                            

5、在5月9日                                                            

6、36张信纸                                                            

7、在第二个十字路口                                                    

8、第九个学生                                                        

9、第一中学                                                           

10、十路公共汽车                                                     

试述腹部4步触诊法的目的及意义。