也许，出版业正在下滑，而且严重的衰退会进一步影响销售。
Perhaps. But the publishing industry is in decline, and a deep recession could hurt sales further.
目前尚未有该手术造成死亡的相关报道，而且严重的并发症也是极其少见的。
No deaths have been reported as a result of the operation, and serious complications are rare.
其他研究人员称，不可能对此类工程学提案进行成本效益分析，因其潜在的负面效果是不确定——而且严重的。
Other researchers say that it is impossible to do a cost-benefit analysis of these engineering proposals because the potential downside is so uncertain - and large.
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