[电] overtone-type piezolelectric cryst-al unit

fàn yīn xíng yā diàn jīng tǐ yuán jiàn ㄈㄢˋ ㄧㄣ ㄒㄧㄥˊ ㄧㄚ ㄉㄧㄢˋ ㄐㄧㄥ ㄊㄧˇ ㄩㄢˊ ㄐㄧㄢˋ