zyc50 发表于 2007-7-17 16:11:26

度量单位是否加"S"有无规律?

a 12-kg fish
The scratch on the bumper is 7.5 cm long.
You may grow up to 3 inches in height
Scientists have accelerated electrons up to an energy of 1 GeV
in a space of only 3 centimeters.
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