As you can tell by the type attribute, this feed offers two: one HTML link, and one back to itself in the Atom format.
从type属性可以看出，该feed提供两个链接：一个是HTML链接，另一个是atom格式的指向它本身的链接。
Tell me what they are one by one, please.
请一张一张地告诉我它们都是些什么。
You can tell by its annual rings. One annual ring means one year.
你可以从它的年轮得知。一个年轮代表一岁。
Traditionally, these were simply plugged in one by one, in a laborious manual process that required an expert human eye to tell the machine what features to look for, in future, at each level.
以往，滤光器只是一个接一个地接通。这一过程由手工完成，极为繁琐，需要一名专家全程用肉眼观察，然后向机器下达指令，告诉它下一步检索什么样的特征。
Traditionally, these were simply plugged in one by one, in a laborious manual process that required an expert human eye to tell the machine what features to look for, in future, at each level.
以往，滤光器只是一个接一个地接通。这一过程由手工完成，极为繁琐，需要一名专家全程用肉眼观察，然后向机器下达指令，告诉它下一步检索什么样的特征。
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