free ride
6.Through discussing the relationship between each of a private mass, a common mass, human being as a doer or as an accepter, the unsustainable economic problems (such as “commons tragedy”, “externality”, “free ride”), and the behavior rules fitting “sustainable development ” have been inferred, too.
10.Make a brand with character, "When beautiful nimble " card report motor-car has the outward appearance novel and pure and fresh, the operation is handy, on the safe side, ride travel is comfortable, noise is low, service life is long, cost can be low, free from contamination, intelligent control, driving moment is big, climbing capacity is strong, glide performance is good, protective function is much, the characteristic such as function stability, once put in the market times accept consumer favour, make strong brand quickly.
