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

这是一种单、一方荷流动。

What determines whether it is unidirectional or bi-directional?

是什么决定了它是单还是双呢？

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

这种单流可以通过调节施加在阴上压来制，压变化会促使阴释放或多或少子。

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单气流，使它们在飞行时也能非常高效地呼吸。

Uh, the security camera microphone is unidirectional.

象头上麦克风是单。

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

React之所以如此成功原因之一在于，它采用了这种单数据流理念，并将其引入到了前端开发中。

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

因此，文化交流变得单，参观者观察而不是参与，只吸收选择性呈现东西。