directional相关例句和用法
Unless he was equipped with a directional microphone, he was out of earshot..除非给他配备一个定向扬声器，否则谁也听不见他。
directional英英释义方向的英释中释adjrelating to the direction in which something is pointing or moving
directional短语directional drilling,定向钻进；定向钻井；定向钻孔.短语
