我不得不拍了他的头一两次，才使他清醒过来。
I had to cuff his head once or twice to get any sense out of it at all.
血的教训使我们的头脑清醒了。
The lessons learned at the cost of blood helped to sober us.
更重要的是，有另外的使人清醒却矛盾的事实：网上消费者一直比线下消费者明显更缺乏价值。
What's more, there was the additionally sobering and confounding fact that an online consumer continued to be worth significantly less than an offline one.
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