It's a unidirectional, a one-directional flow of electrical charge.

这是一种的、一方的电荷流动。

What determines whether it is unidirectional or bi-directional?

是什么决定了它是还是双的呢？

Uh, the security camera microphone is unidirectional.

监控摄象头上的麦克风是的。

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

因此，文化交流变得，观者观察而是与，只吸性呈现的东西。

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

它们很可能像现代鸟类一样具有气流，使它们在飞行时也能非常高效地呼吸。

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

这种电流可以通过调节施加在阴极上的电压来控制，电压的变化会促使阴极释放或多或少的电子。

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，它采用了这种数据流的理念，并将其引入到了前端开发中。