Ofallthematerialsprovidedbynatureformantouseasamaterialofconstruction,naturalrubberisunique.Thecharacteristicofhighreversibleextensibilityfascinatestheenquiringmind.AstheyearshavepassedsinceitsintroductiontotheEasternHemispherebyColumbusandhisfellowexplor (共 9350 字) [閱讀本文] >>