提示：点击例句中的单词，就可以看到词义解释

Breakdown diode . Unidirectional or bi-directional can be specified .

击穿二极管。可指定单向或双向。

The most common polar pattern is omnidirectional , though unidirectional types may be used to control excessive ambient noise or severe feedback problems .

最普通的指向性为无指向性，尽管指向性类型可以控制过多的环境噪声或严重的啸叫问题。

But the other issue , as clare talwalker , an indian-born anthropologist attached to the centre explained , is that it is increasingly misguided for students to view aid as a unidirectional gift .

但正如该中心工作人员、出生于印度的人类学家克莱尔塔尔沃克（claretalwalker）所指出的，另一个问题在于，学生们越来越将援助误认为是一种单方面的馈赠。

So what is a unidirectional dataset good for ?

那么，单向数据集有什么好处呢？

Channels can be unidirectional or bidirectional .

通道可以是单向的或双向的。