-
1. The device operates at small frequencies, which makes it difficult to detect.
该设备在小频率下运行，这使得检测变得困难。
-
2. The radio waves have a small frequency range, so they can only be used for short distance communication.
无线电波的频率范围较小，因此只能用于短距离通信。
-
3. The scientists are working on developing a new technology that can operate at small frequencies.
科学家们正在研究开发一种新技术，可以在小频率下运行。