book - something can be read, dozen - 12 unit, oxygen - an element that help to combust, triangle - a geometric figure, thailand - a country in ASEAN, force - something that make things motion, unless - a conjunction (if.....not....), since - a conjunction that has the same meaning as because, avogadro number - 6.02*10-23, insulin - a hormone that is created from pancrease,

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