The revelations have led to questions about safety and whether corrupt subcontractors cut corners to line their pockets.

这些问题进一步让人质疑安全问题，承包商是否偷工减料中饱私囊也被打上一个问号。

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But the research on this treatment is still at an early stage, and many questions remain about its safety and effectiveness.

不过，针对这种疗法的研究还处于初级阶段，有关其安全性及疗效还存在许多问题。

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Over the decades, the fears have waxed and waned, but questions about their safety are still debated.

几十年以来，这种畏惧感经历了阴晴圆缺，但关于它们安全性的问题还在争论当中。

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But knowing all the concerns and questions about safety aboard cruise ships, I'd want answers before I took a cruise.

CNN: Covering a cruise ship disaster

Lucentis studies are important because they raise questions about safety and efficacy.

FORBES: Patient Safety and 'Off-Label' Drug Use

As Facebook reportedly prepares to open up its service to users younger than 13, these cases renew questions about safety and security of children on social networks.

FORBES: Skout Shuts Down Teen Service After Rape Cases Alleged