单词：frequencies
n the ratio of the number of observations in a statistical category to the total number of observations
n the number of observations in a given statistical category
frequencies的用法和样例：
例句
- At some frequencies, it can penetrate walls.在一些频率，它能穿透墙壁。
- Confined waves have definite frequencies.被限制的波具有确定的频率。
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