His face took on a set expression.

他脸上现出凝滞的神态。

《牛津词典》

The power behind much of this automation is the regular expression, a veritable set of hieroglyphics to find, match, and decompose strings.

实现这种自动化主要依靠正则表达式，它是用来查找、匹配和分解字符串的一组真正的象形文字。

youdao

These transformations group a set of mappings based on a given XPath expression condition.

这些转换根据给定的 XPath 表达式条件对映射进行分组。

youdao

And this universality was given expression in Dante's famous treatise, De Monarchia, of monarchy, that set out a model for a universal Christian state, based on the unity and oneness of the human race under a Christian ruler.

而这种特性可追溯,至但丁的著名论述《论王权》,探讨君主政权,这设定了一种普遍基督国的模式，根据统一,与独一的人种皆受基督王权的统治。

耶鲁公开课 - 政治哲学导论课程节选

For many, the vote was an expression of ethnic solidarity, rather than an endorsement of a set of policy ideas.

ECONOMIST: South Africa

So far there has been no expression of interest from England or Scotland in following the international lead set in a tiny town in rural mid-Wales by a charity that does not have a phone line and makes all its calls on Skype.

BBC: Charity reaches rainforest goal

Submitting an Expression of Interest by the set date (9 January 2015) does NOT also stand as submitting a formal application, such applications follow a separate process and are due on February 9 2015.

UNESCO: Marking UNESCO's seventh decade