用不着她一来电话你就往楼上跑。You don't have to go running upstairs every time she rings.除非知道密码，否则谁也用不了那台计算机。No-one could use the computer unless they had a password.用不了5小时，设备就又能嗡嗡地运转了。Within five hours, the equipment will be humm...