frequency statistics的用法和样例：
例句
- They maintain that the population base used to give frequency statistics must be drawn from the suspect's particular gene pool.
他们声称用于频率统计的人口基数必须从嫌疑犯的特定基因库中获得。 - It is usually necessary to do various frequency counts with the more advanced type crypts.
在解一个较难的密码时，通常需要进行各种频率统计。
