例句與造句

1. Researchers say that a " backward traveling wave " can explain why traffic jams sometimes appear seemingly out of nowhere . cynthia graber reports
   研究人員稱“反向駕駛浪潮”能夠解釋為何交通阻塞有時(shí)候似乎好像無(wú)緣無(wú)故的出現(xiàn)。
2. It's difficult to find backward traveling wave in a sentence. 用backward traveling wave造句挺難的