These four things are the focus of a recent video presentation by renowned cardiovascular expert Dr. Chauncey Crandall: Silent Heart Attacks: a Special Newsmax Heart Health Report.

这四种征兆就是知名心血管专家昌西。克兰·多尔博士在最近的“心肌梗死：心脏健康的特刊”报告中不断强调的重点。

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Shark expert Vic Hislop warned there would be more attacks because sharks had been forced to look at humans as an alternative food source.

鲨鱼专家Vic Hislop警告说，因为鲨鱼不得不将人类作为食物来源的代替品，所以可能还会有鲨鱼袭击人类的事件发生。

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An external hacker is probably an expert in security attacks, but might not have any particular grudge against you.

外部黑客也许是安全性攻击方面的专家，但是他们对您可能没有攻击动机。

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Of course, the difference between these experiments and a real-world instance of the attacks is a motive capable of inspiring a team of equally expert hackers to achieve the same feats of tech exploitation.

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Moreover, Ben Emmerson, a United Nations expert on counterterrorism and human rights, announced plans in October to investigate U.S. drone attacks and the extent to which they cause civilian casualties.

CNN: Senate panel gets classified drone document from Obama