例句與造句

1. Wear is primarily associated with the introduction of contaminants and sealing arrangements must be chosen ( with regard to the hostility of the environment
   磨損主要與污垢的出現(xiàn)有關(guān)， （所以）必須根據(jù)環(huán)境的不利因素來(lái)選擇密封裝置。
2. It's difficult to find introduction of contaminants in a sentence. 用introduction of contaminants造句挺難的