The two currently widely used indexes, Near Point Distance (NP) and Critical Flicker Fusion Frequency (CFF), have their intrinsic defects.是什么意思_The two currently widely used indexes, Near Point Distance (NP) and Critical Flicker Fusion Frequency (CFF), have their intrinsic defects.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句