People use tools to measure things. 
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Bronze ruler. Han Dynasty 206 BCE to CE...
Gilded Bronze Ruler - 1 chi = 231 cm....
ROC1915-01-06--01-16政府公報956--965.pdf
ROC1929-02-20國民政府公報97.pdf
Chinese-measuring-tape.jpg
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Content adapted from Wikipedia
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Readability: FK 9.0
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Vital Level 5