[生态] frequency index
... flashing,闪阀 frequency index,频率指数 field controller,磁力场控制器 ...
index of frequency
... 属的庞杂度指数;属的歧异度指数 index of diversity of genus 频率指数 index of frequency 族群趋势指数 index of population trend ...
Inverse document frequency
SAIFI
Index pluvial