1·The bat emits these ultrasonic pulses, very high pitch sound waves that we cannot hear.
蝙蝠会发出我们听不到的非常高的超声波脉冲。
2·The most useful item above was probably this 15 year old ultrasonic humidifier. It produces large amounts of real fog.
上述项目中最有用的或许是这个有着15年历史的超声波增湿器，它产生大量真正的水雾。
3·Nor would he have known that ultrasonic vibrations from a plate-like transducer would shake those glass beads into the air to be tweezed and measured as they moved in suspension.
爱因斯坦也无法知道由盘型传感器产生的超声波振动能将空中这些玻璃微珠钳除，再在它们悬垂在空中移动时进行测量。
4·But whales communicate better through ultrasonic sounds than through human-audible sounds, especially underwater, "he explained."
但与人耳可听见的声音相比，鲸鱼更‘擅长’用超声波交流，尤其是在水下。
5·First, the robot's sensors - for example, touch sensors, light sensors, and ultrasonic sensors - take in information from its environment.
首先，机器人的传感器(例如接触传感器、光线传感器和超声波传感器)从它的环境中获得信息。