The other major safety concern Mr. Cohen raised is the ability of passengers to exit a plane in the event of an emergency.

科恩关心的另一项安全问题是旅客紧急情况下的疏散问题。

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Furthermore, the high energy capacity and potentially volatile nature of some battery technologies is a major safety concern.

此外，某些电池的高能量容量和潜在的易变性也是主要的安全隐忧。

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However, in some cases, the cells formed clumps of cancerous tissue called teratomas, a major safety concern with stem cell therapies.

然而，某些情况下，这些细胞形成了称作畸胎瘤的癌变肿块，这也是干细胞疗法的一个主要安全问题。

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Safety in schools has been a major public concern in China since a devastating earthquake in Sichuan province in 2008 killed tens of thousands of people.

BBC: China landslide: All 18 children killed

The fire, and the lack of safety precautions at the venue, have prompted widespread concern about Brazil's ability to host major sporting events in the next four years.

BBC: Brazil nightclub fire: Four charged with manslaughter