如果需要根据适配器连接的链路伙伴或网络检查设置，介质速度是有用的，因为速度或双工不匹配会造成问题。

The media speed is useful if you need to verify the setting based on the link partner and network that the adapter is connected to, as a speed or duplex mismatch can cause problems.

youdao

这种拉取 方式的频率要足够高才能保证很高的数据精确度，但高频率可能会导致多余的检查，从而导致较高的网络流量。

The pulling frequecncy needs to be high to ensure high data accuracy, but high pulling frequency may induce redundant checks leading to high network traffic.

youdao

或者，更常见的情况是，您可能需要检查社交网络数据，试图解析该数据，了解某种趋势，比如您的公司被提及的频率，以及这种提及是正面的还是负面的。

Or, more commonly, you might look at social network data and attempt to parse trends from it, such as how often your company is mentioned and whether it's mentioned in a positive or negative light.

youdao

But when you start writing programs, especially when we get to web-based stuff where you want -- to check the user's input -- is it valid, is it an email address, -- and all these different scenarios -- it's actually often useful to be able to just enumerate them or rattle them off using this switching construct instead.

但是当你看是写程序时，特别是当我们,使用基于网络的东西，你想要,检查用户的输入-,它是合法的吗？它是不是一个电子邮箱地址？,所有的这些场景-,实际上它常常是有用的，当你用枚举结构列举它们,或者用它来快速地来说出它们。

哈佛公开课 - 计算机科学课程节选