ADJ-GRADED
(天線、擴音器等)定向的
If something such as a radio aerial, microphone, or loudspeaker is directional, it works most effectively in one direction, rather than equally in all directions at once.
例句
Dish aerials are highly directional...
碟形衛星天線的定向性非常強。
The directional microphone trained on Foresters Cottage could pick up every word uttered inside at several hundred yards.
對準福雷斯特小屋的定向擴音器在幾百碼遠的地方也能捕捉到里面的人所說的任何一句話。