例句與造句

1. The vertical axis is then not the frequency but " frequency density "  the number of cases per unit of the variable on the horizontal axis.
2. In other words, a histogram represents a frequency distribution by means of rectangles whose widths represent class intervals and whose areas are proportional to the corresponding frequencies : the height of each is the average frequency density for the interval.
3. It's difficult to find frequency density in a sentence. 用frequency density造句挺難的