discrete frequency的用法和樣例：
例句
- Any of several devices that convert incident electromagnetic radiation of mixed frequencies to one or more discrete frequencies of highly amplified and coherent ultraviolet, visible, or infrared radiation.
激光器使偶然的混雜頻率的電磁輻射，變?yōu)橐粋€(gè)或更多的高度強化和連續的紫外線(xiàn)、可見(jiàn)光或紅外線(xiàn)輻射的分離頻率儀器中的一種
