But behind all that confidence, I figure, must be some hard lessons learned.

但是我知道，在这所有的自信背后，都有一些深刻的教训。

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This makes it hard to generate enthusiasm for another round of lessons learned, and has been used as an argument to forego collecting any more data.

这使得很难产生了解另一轮经验的热情，并且用作放弃收集更多数据的论点。

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Many of these rules embody lessons learned the hard way from banking collapses in the mid-1980s.

这些规则中的许多条款都能表明，这是汲取了20世纪80年代中期银行崩溃的教训。

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Bound and determined to succeed, I maintained a positive attitude by noting that the hard lessons learned from failures can be incredibly valuable.

FORBES: Be Humble and Teachable to Lay the Foundation of Success

The hard lessons learned in places like Tarawa and Guadalcanal served the U.S. well when Marines turned the tide of war in Korea years later by mounting a daring amphibious landing at Inchon, behind enemy lines.

FORBES: Marines Fight For Crucial Vehicle As Budget Cuts Loom

But the hard lessons were learned perfectly.

ECONOMIST: Elisabeth Schwarzkopf