Uh, the security camera microphone is unidirectional.

监控摄象头上的麦克风是单向的。

Consequently, the cultural exchange becomes unidirectional, with visitors observing rather than participating, and assimilating only what is selectively presented.

因此，文化交流变单向，参观者观察而不是参与，只吸收选择性呈现的东西。

They probably had unidirectional air flow, just like modern birds do, making them very efficient at breathing, even while flying.

们可有单向气流，就像现代鸟类一样，这们即在飞行时也非常有效地呼吸。

This unidirectional current flow could be controlled by varying the voltage to the cathode, which makes it release more or less electrons.

这种单向电流可以通过改变阴极的电压来控制，这释放更多或更少的电子。

One of the reasons why React was so successful is because it took that unidirectional flow, brought it to the front end.

React之所以如此成功的原因之一在于，采用了这种单向数据流的念，并将其引入到了前端开发中。