directional

1. ADJ If something such as a radio antenna, microphone, or loudspeaker is directional, it works most effectively in one direction, rather than equally in all directions at once. (廣播天線、麥克風(fēng)或揚聲器)定向型的[技術(shù)]

Unless he was equipped with a directional microphone, he was out of earshot. 除非給他配備一個定向揚聲器，否則誰也聽不見他。

2. ADJ Directional means relating to the direction in which something is pointing or going. 方向的[技術(shù)] [usu ADJ n]

Jets of compressed air gave the aircraft lateral and directional stability. 壓縮氣體噴流從側(cè)面和正面穩(wěn)定了機(jī)身。