During the colonial era ,the impact of Portuguese law on African customary law mainly included three ways: on administration, African customary law was weakened by enlarging the powers of the colonial government etc.

The conventions of electricity generating,electricity receiving,left-hand screw and right-hand screw.

It is the result of interaction between convention and adaptability.

Therefore, while the ritual activities come to be the tradition with the propagating of ethnic group, aesthetic activities mingled with them also gradually develop into some kind of “convention” that could be regarded as objective aesthetic measure.

And assuming that the leader corporation might get the choice which he would "inherit" the routine,we arrive at the conclusion that with the passing of time,the so-called "the advantage that you will have if you act fir.

It bases on the bounded rationality assumption, builds a non-balanced and dynamic theoretical framework, uses routine as the ″ge- ne″ for the enterprises evolution, and focuses on diversity and novelty.

From a synchronic point of view,language as a system remains relatively stable;but from a diachronic point of view,language is a routine in constant emergence and evolution.