They may not sound dangerous, but they are.

听上去它们也许不危险，可是实际却是。

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These substances may make tombs sound dangerous, but scientists seem to agree that they are not.

这些东西可能会使古墓听起来很危险，但是科学家们似乎觉得并不是这样。

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While the elevated levels sound dangerous, there is no direct damage done to sea life or humans from it, he said.

他说，辐射水平升高听起来很危险，但是没有对海洋生物和人类造成直接的危害。

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Jack White has described the sound as "really dangerous and abrasive."

VOA: special.2009.08.07

Before long the speaker realizes that this fantasy is starting to sound a little extreme or maybe a little dangerous.

不久之后诗歌发言者意识到,这个幻景,开始听起来有点过头或危险了。

耶鲁公开课 - 弥尔顿课程节选

Considering that the Ohio replacement will be by far the most important component of the U.S. nuclear deterrent a generation from now, these moves sound like an extremely dangerous approach to promoting efficiency.

FORBES: Why Pentagon Weapon 'Efficiencies' Are Often An Illusion

Christina McAnea, head of health at the union Unison, said the report showed the deal was a "dangerous" experiment, which should "sound alarm bells".

BBC: NHS 'must be tougher negotiator' on private deals

People using earbuds with lower sound quality attempt to drown out background noise and enhance audio clarity by increasing the volume to dangerous levels.

ENGADGET: Future Sonics debuts Atrio Special Edition professional earphones