Just to be sure I kicked off an extra backup and once done did a test boot using the external drive to ensure I had an easy return path to Snow Leopard if things went badly wrong.
我只是要确定，我所开始的这次额外备份在其完成之后，会使用外部驱动来进行一次测试启动，这就确保了如果事情出现了严重错误的话，我会有一种很容易就返回到Snow Leopard中的手段。
I had been asked to drive in heavy traffic and had done so successfully.
按照要求在车辆拥挤的路上驾驶，我圆满地完成了。
I had been asked to drive in heavy traffic and had done so successfully.
我被要求在繁忙的马路上驾驶，我开得相当成功。
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