efrBNC¹⁷³⁹⁹⁵⁺² 基本例句 effective filtration rate 有效滤过率 The voice quality of GSM system can be improved through many kinds of technologies, such as noise suppression, interference canceling and Enhanced Full Rate EFR coding. GSM系统可以通过采用多种技术来改善话音质量，如采用噪声抑制、干扰消除和增强型全速率编码 EFR等技术。 cnki