送交者: steven 于 2006-2-16, 13:31:04:
回答: bike 由 habpi 于 2006-2-16, 13:14:34:
making bike uses synthetic rubber, matel and paint. In the process there are harmful to the environment. Train, well, too many hazardous things to mention. Even foot wears are bad. Therefore, the only choice is to walk on bare feet.