In recent years, reports linking vaccines to autism have been debunked, but fears of adverse events — which experts say are rare — have proven difficult to erase.

近年来，一些将疫苗同自闭症相联系的报告已被证明是错误的，专家也表示注射疫苗后很少出现不良事件，但是，人们对此所产生的恐惧却很难消除。

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In a perfect world, this would be sufficient, but computers and software can crash, power can fail, and other unpredictable, catastrophic events can conspire to erase your work.

在一个完美的世界里，这就足够了。但是计算机和软件会崩溃，电源可能会断掉，其他不可预测的灾难会凑巧同时发生而丢掉你的工作。

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The essence of nature is that it can, through transformation, slowly erase all traces of the tragic events that happened here.

自然的本质在于它可以经历演变，慢慢地清除曾在这里发生的悲惨事件的痕迹。

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But recent events show that Dell did nothing to erase the problem--a group of women have now sued the company for discriminatory practices.

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