1. The microphone has a unidirectional pickup pattern, which means it only captures sound from one direction.
这个麦克风具有单向接收模式，意味着它只能从一个方向接收声音。

2. The unidirectional flow of traffic on this street helps to reduce congestion and improve safety.
这条街道上的单向交通流动有助于减少拥堵并提高安全性。