directional 核心词议：
adj. 指向的；方向的
directional 基本解释
速记方法知识扩展
中文词源
中文词源：
directional
精选例句
1、 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。
常见考点例句：
- This led to breakthroughs in 3d seismology and directional drilling .
- 这就导致了在3d地震学和定向钻井上的突破。
- The patrol quickly reversed direction-and ran smack into a directional explosive device .
- 巡逻队迅速折回---恰巧一股烟飞奔到安放定向爆炸装置的区域。
- A technique called " directional drilling " has transformed the energy business .
- 一项名为“定向钻井”的技术改变了能源业。
- Yet accusations were widespread that the trades were more likely directional bets that went wrong .
- 一种广泛认可的指控指出，这场贸易更像是误入歧途，变成了一场定向交易。
- Directional antennae , unlike the omnidirectional sort , transmit on a narrow beam .
- 这种定向天线并不像那些全方位传输的类型，它只有一个很细微的电子波束。