灾害风险的累积是悄然无声的。

The risk of disaster quietly accumulates.

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现代潜艇的航行是悄然无声的。

Modern submarines are very, very quiet.

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与此同时，iPhone已悄然无声成为最为广泛使用的电子书阅读器：更多人选择为iPhone下载电子书阅读软件(如Stanza, eReader和Classics)而非购买Kindle。

The iPhone, meanwhile, has quietly become the most widely used e-book reader: more people have downloaded e-book software (such as Stanza, eReader and Classics) for iPhones than have bought Kindles.

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