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.
吉布斯：他现在许多事都放在心底不说，那是他的血的教训。
Gibbs: he puts things closer to the vest now. And a hard-learned lesson it was.
这些过去的战争所留给我们的血的教训，应该着重地学习它。
We should seriously study these lessons, paid for in blood, which are a heritage of past wars.
血的事实，血的教训，让我们再一次静静的思考安全这个沉重的话题吧！
Blood truth, the lesson written in blood, let us consider once again the quiet security of this heavy topic!
“为了将来不出现类似的惨剧，我们一定要讨个公道”，这位母亲说，“这是血的教训啊。”
"We want justice to prevent future tragedies, " says the mother. "This is a lesson of blood.
从未遂事故中、从轻微的事故中、从别人的事故中学习，是避免去亲身感受血的教训的最好方法。
Learn from the near-misses, learn from the trivial incident, learn from other's accident, are best ways to avoid the learning in a bloody way.
这就是早期创业世界的自然法则，而且最好是让企业家参与其中，通过那些血的教训，换取更多的机会和风险。
That's just the nature of the early stage venture world, and ideally it allows the entrepreneurs involved to apply their hard-earned lessons towards more productive ventures.
当然采用实验而后发现错误进行建造机器和工业过程是没有问题的，在过去的几个世纪中，有过无数血的教训。
There is no question that the trial-and-error process of building machines and industries has, over the centuries, resulted in the loss of much blood and many thousands of lives.
当然采用实验而后发现错误进行建造机器和工业过程是没有问题的，在过去的几个世纪中，有过无数血的教训。
There is no question that the trial-and-error process of building machines and industries has, over the centuries, resulted in the loss of much blood and many thousands of lives.
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