Two kinds of ways to express one's emotion, i. e. expression and representation are drawn abstractly from different types, styles and ideals of works of art.

人们从不同门类、风格、观念的艺术作品中，抽象出其表达情感的两种方式：再现与表现。

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And we can simplify this expression as saying negative e squared over 4 pi, epsilon nought r squared. Epsilon nought is a constant, it's something you might see in physics as well.

也会遇到它,在这里，你可以就把它,理解为一个转换系数,我们需要做的。

麻省理工公开课 - 化学原理课程节选

Jillian York, director of international freedom of expression at the Electronic Frontier Foundation, said in an e-mail that YouTube and Facebook generally are doing a good job of making sure videos from Syrian activists surface on their platforms.

CNN: 'SNN,' YouTube help amplify voices in Syria

In total, the expression of 42 genes linked to vital processes in human cells was altered by the presence of E. faecalis in this state.

BBC: How gut bugs could trigger cancer