，老爸连忙开着车在高速上饶一圈，充够了电才回家。" Unless your battery/alternator is faulty, usually 15-20 minute normal driving(20-30 miles/hour) should be enough to charge the bettery. Furthermore, if you were really concerned about the full charge, you didn't have to "在高速上饶一圈". You just need park the car, rev it up a few times. And you can decide how many times to make you feel confortable.