He was determined to track down the cause of food spoilage.他决心查出食品腐烂的原因.Car manufacturers stamp a vehicle identification number at several places on new cars to help track down stolen vehicles.汽车制造商在新车的好几处地方打上车辆识别号码，以便于追...
The number of signers of the petition for a new school snowballed.要求增设新学校而签名的人像滚雪球似的越来越多.The court rejected their petition.法庭驳回了他们的上诉。They began to petition the queen.他们开始企求女王....
Over the years he's demonstrated a certain prescience in foreign affairs.这些年来，他已经在外交事务方面表现出一定的预见性。The BBC has just successfully demonstrated a new digital radio transmission system.英国广播公司刚刚成功地演示了一套新的数字无线电传输系统。Cather...