Cov tub ntxhais kawm qib 3 hauv New York thiab Paris cov chav kawm tau ua haujlwm rau kev ntsuas. Lawv tau kwv yees qhov ntev ntawm ntau yam khoom thiab tom qab ntawd ntsuas lawv hauv centimeters thiab millimeters thiab nrhiav qhov sib txawv ntawm ob lo lus teb. Tom ntej no, lawv yuav kawm yuav ua li cas hloov ntawm millimeters, centimeters, meters thiab kilometers. Nyob zoo, qib 3s!
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