A known element, say a piece of iron, for example, is heated from pure gas flame.

一块已知的元素，比如说铁，会在纯净的气体下燃烧，一直加热到有射线放出。

youdao

Although you could model all your data without attributes, they can be a very intuitive choice for data items which are known in advance to never repeat (per element) nor have any sub-fields.

虽然不用属性也可以对所有数据进行建模，但是对于预先知道不会重复(对于每个元素而言)，也没有任何子字段的数据项，使用属性仍是最直观的选择。

youdao

The process is simple: you take a known image - called the memory peg - and combine with the element you want to memorize.

过程很简单：你选择一个已知的图像——称为记忆挂钩——和你想记住的要素结合起来。

youdao

In collaboration with Elena Pasyukova at the Institute of Molecular Genetics, in Moscow, and Trudy Mackay of North Carolina State University at Raleigh, he has been studying a transposable element known as copia.

ECONOMIST: Truly selfish genes

Peter Thermos, chief technology officer of Palindrome Technologies , proved the point onstage: He played snippets of conversations recorded by snooping on VoIP calls, exploiting vulnerability in a common element in VoIP communications known as media gateway control protocol.

FORBES: Magazine Article

Aside from involvement of a well-known individual, the Rolle litigation had another distinctive element.

FORBES: IRS Tackles Giants Safety Antrel Rolle--Hard