introduction of contaminants造句

例句与造句

1. Wear is primarily associated with the introduction of contaminants and sealing arrangements must be chosen ( with regard to the hostility of the environment
   磨损主要与污垢的出现有关， （所以）必须根据环境的不利因素来选择密封装置。
2. It's difficult to find introduction of contaminants in a sentence. 用introduction of contaminants造句挺难的