Provine realized that the reason chimps cannot emit a string of "ho ho ho" is that they cannot make more than a single sound when they exhale or inhale.

普罗文认识到，黑猩猩之所以不能发出一连串的“呵呵呵”声音的原因，在于它们在呼气或吸气时无法发出一个以上的音节。

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This sleek design allows single sounds to convey useful information, and in fact, even the absence of a sound has been enlisted to express something specific.

这种圆滑的设计使单一的声音也能传达有用的信息，事实上，即使没有声音也会被用来表达一些特定的含义。

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These women seem to be shaking badly and they haven't made a single sound this whole time.

这些女人似乎抖得很厉害，而且一直没有发出任何声音。

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(Sound) The blast in Peshawar was the deadliest single attack this year in Pakistan.

VOA: standard.2009.10.28

She won a place in Girls Aloud through reality TV show Popstars: The Rivals in 2002, and their first single Sound of the Underground went straight to number one.

BBC: NEWS | UK | Tweedy and Cole in wedding ruse

In Finnish, exceptionally, each letter makes a single logical sound and there are no irregular words.

ECONOMIST: Education reform

Mr. WANG: The combos nacionales never boasted a single signature sound in the same way we associate samba with Brazil or (unintelligible) with Cuba.

NPR: The Sounds of Panama's Mixed Musical Heritage