Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
tractor-trailer – n. large truck with a trailer attached to the back
disruption – n. an interruption in normal progress
blur – v. to make unclear or confused
theoretically – adv. related to something that is possible, but not yet known to be true
sustainable – adj. able to be maintained at a certain rate or level
rational – adj. based on facts or reason and not emotions or feelings
