New electric engines coupled with artificial intelligence and autonomous systems will contribute to a more efficient, integrated transport system that is less polluting and less noisy.
2019年6月六级真题（第二套）阅读 Section A
柯林斯高阶英汉双解学习词典释义
VERB
污染；弄脏
To pollute water, air, or land means to make it dirty and dangerous to live in or to use, especially with poisonous chemicals or sewage.