"the frequency of modulation was 40 cycles per second" "the frequency of his seizures increased as he grew older"
frequence是什么意思
frequency是什么意思
frequent是什么意思
frequentation是什么意思
frequentative是什么意思
frequenter是什么意思
frequentist是什么意思
frequently是什么意思
frere是什么意思
fresco是什么意思