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错误和挫折教训了我们，使我们比较地聪明起来了，我们的事情就办得比较好一些。The mistake we committed and the setbacks we experienced have taught us lessons and made us wiser, therefore we can handle our affairs better.

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Through scientific practice we’ve come to realize that matter can neither come from nought nor can it be reduced to nought; the total mass of reagents before reaction is constantly equivalent to that resultants after reaction the law of conservation of matter.物质不能由无到有，也不能由有到无；化学反应物的质量之总和与化学反应后生成物的质量之总和是恒等的，这就是物质不灭定律。我们通过科学实践认识上述规律。

He had received information the night before that certain Soviet personnel in New York were apparently preparing to destroy all sensitive documents. ... I asked myself as I drove to the White House if the Soviets were anxious to find an answer to the crisis，why this conduct on the part of Soviet personnel?他在上一天晚上得到情报说，在纽约有某一苏联人员显然在准备销毁所有非常机密的文件。我一边驱车前往白宫，一边暗自问道：如果苏联人急想寻求一项对这一危机的回答，这个苏联人员又为什么要这么举动呢?

They rode with a little more energy. Here at last was a large group of people, one or more of whom might have seen a white man and a boy. Charles knew the odds against it but at least it was a crumb. Until now, they'd been starving. 他们骑马上路，稍微有了点精神。终于遇上了一大帮人，他们中也许有人会看到一个白人和一个孩子。查尔斯知道可能性很小，但至少有一丁点希望，在这之前他们连一点希望都看不到。

As the tulip trades increased, regular markets were set up on the Stock Exchange of Amsterdam and other towns.当郁金香交易进一步发展，大家就在阿姆斯特丹股票交易所和一些城镇设立了固定的市场进行买卖。