Article in English: Measure your height with your makeshift ruler if you don’t have a tape measure or standard ruler.  Consider this method if you need to find your height right away and don’t have time to get a ruler. Be aware that this will be an approximate measurement. Making a ruler by measuring a dollar bill is easy because all bills in the United States are 6 inches long (½ feet).  Lay the bill next to the string. Lay the bill and string flat with your hand. Mark the end of the bill on the string with a marker and repeat until you reach 6 feet. Use another bill if you don’t have a dollar bill. Attach the string to the wall using tape.  Be sure not to break the string. Stand up straight with your feet and back against the wall. Mark the top of your head on the wall. Look at the string to find your height.

Summary in Chinese:
用一张100元纸币、一条绳子、胶带和记号笔制作尺子。 用百元纸币帮助你制作尺子。 像使用正常尺子一样，使用自制的临时尺子。