The only other mandatory setting for those services is the frequency, which must be specified by a cron-like expression.

这些服务还有另一个必需的设置——频率，必须用与cron相似的表达式指定频率。

youdao

Like Helen Martins, outsider artists add new life, imagination and skill to the world of creative expression.

VOA: special.2010.04.14

I just want to remind you, if I wanted to, for example, type in an expression like that, notice the syntactical form, it's an expression, a number, followed by an operand, followed by another expression.

我想要提醒下大家，如果你想要，例如，输入一个这样的表达式，注意语法形式，这是个表达式，一个数字，后面是一个运算对象，后面是另外一个表达式。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's expression and it's like art, you know.

这是一种表达，像艺术，嗯。

你如何看待纹身？ - SpeakingMax英语口语达人

"More connected individuals might be better equipped to perceive social cues like facial expression" and might derive more positive experience from social interaction, writes Dr. Dickerson in a recent paper.

WSJ: When Social Skills Are a Warning

With an expression like someone sucking on an unpleasant cough drop, he made his way over to me.

NEWYORKER: The Region of Unlikeness

But then you had some women who luckily had parents who sort of had broader boundaries when it came to self-expression, like Shannon Erris(ph), who's a stylist, oh, and she's a salon owner who lives in Harlem, had natural hair as a child, and her mother encouraged that, and now she has locks herself.

NPR: 'Queens': Black Women, Fabulous Hair