Considering the errors of the conventional back seeking method regarding the manufacturing error,application error and test error,resulting in the inconsistency of the data between the primal data and the back seeked data,it is pointed out that analysis of the motion law of the cam profile can be done with nominal speed,nominal acceleration and nominal bounce.

The concept "torsional vibration in the neighborhood of nominal motion of belt drive pulley systems" is presented.

These verbs using non-nouns as objectives can be classified according to their functions, among which the verbs using non-nouns as objectives should be classified into four categories, whereas the verbs using non-nouns as well as nouns as objectives should be divided into nine categories.