At this fantastic news, Darwin bounded forth in ecstasy, the sound of his geological hammer ringing from hill to hill.

听到这个梦幻般的消息，达尔文顿时欣喜若狂，他的地质锤响过一山又一山。

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It is the sound of workers cutting through all of the re-bar to pour the foundation for the apartment house being built next door but striking it with a small hammer, repeatedly, until it breaks.

隔壁正在兴建的公寓，一群建筑工人正在切割修建地基所用的钢筋，不过是用一把小铁锤不断地锤打，直到钢筋断裂。

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Ceramic tile: use a small hammer knock on to see if free drum sound, groove seam is full, ceramic tile stick whether level off.

瓷砖：用小锤子敲敲看是否有空鼓的声音，沟缝是否饱满，瓷砖贴的是否平整。

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Piano keys each have three strings that, when struck by a felt-covered hammer, make a musical sound. (The exceptions are the bass keys, which have either two strings or one.) Pressing the soft pedal shifts the hammers so only two of the three strings are touched, giving the piano a much softer tone.

WSJ: When Two Makes Perfect | By Byron Janis