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时差N小时:锋利的刀刃有何特别之处?(下)

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First hold the nail with the wide head by its shaft and push it head-first into the ball of clay. Then do the same with the small-headed nail.

首先将宽头钉的杆竖起,将其头朝下推入橡皮泥球。然后对窄头钉再重复一次。
The small-headed nail goes into the clay much more easily than the wide-headed nail. Since the head of the small nail has less surface area than the big one, the force of your push is concentrated in a smaller area, exerts more pressure on the clay, and so the nail goes in more easily. The same principal causes pointed high-heeled shoes to sink into a soft surface more easily than flat shoes.
窄头钉比宽头钉更容易嵌入橡皮泥。由于窄头钉的头部面积比宽头钉小,你的推力将集中在一个更小的区域,对橡皮泥产生更大的压力,因此钉子更容易嵌入。同理,尖高跟鞋比平跟鞋更易陷入表面柔软的物体。

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By applying this principal to the knife you can see that with a keener edge there’s a greater concentration of the pressure on the edge, so it takes much less force to make the knife cut.

将这一原理运用在刀上,你会发现,刀刃越锋利,压力就会更加的集中,因此切割起来也更加省力。

译文为可可英语翻译,未经授权请勿转载!

重点单词   查看全部解释    
shaft [ʃɑ:ft]

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n. 轴,杆状物,矛,柄,竖井,(一道)光线

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clay [klei]

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n. 粘土,泥土
n. (人的)肉体

 
concentration [.kɔnsen'treiʃən]

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n. 集中,专心,浓度

 
pressure ['preʃə]

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n. 压力,压强,压迫
v. 施压

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concentrated ['kɔnsentreitid]

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adj. 全神贯注的,浓缩的 动词concentrate

 
sink [siŋk]

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n. 接收端,沟渠,污水槽,散热器
vi. 下

 

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