单词	永冻[层]
释义	永冻[层]permafrost
随便看	tunable device tunable digital filters tunable dispersion compensation tunable dispersion compensator tunable dispersion slope compensation tunable fiber bragg grating tunable fiber fabry-perot filter tunable fiber fabry-perot {=fpf} filter tunable fiber laser tunable filter tunable frequency tunable laser tunable laser diode tunable laser dye tunable laser source tunable--laser t tunable magnetron tunable mid-infrared laser tunable millimeter wave source tunable multiwavelength switching tunableness tunablenesses tunable notch filter tunable optical filter tunable optical time-division reflectometer