He placed a marker where the ball had landed.

他在球落地的地方放了个标记。

《牛津词典》

Could you give me a marker, please?

请给我一只记号笔，好吗？

youdao

Hugging "is a marker of intimacy and helps generate the feeling that others are there to help in the face of difficulty."

拥抱是“亲密的标志，它帮助自己在面对困难时产生别人会伸出援手的感觉”。

youdao

In nineteen seventy-three,Alice Walker placed a marker in Fort Pierce,Florida, where Hurston is believed to be buried.

VOA: special.2009.02.22

And in red is a hair cell marker that labels sensory hair cells and the yellow color is the composite color of the green and the red.

红色部分是遗传标记,代表的是听觉毛细胞,黄色是,红和绿两色的复合色。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

We've learned how to identify and catalog cells according to the composition of proteins on the surface and those proteins that distinguish a cell are often called marker proteins.

我们学会了如何按照表面的蛋白成分,来识别并分类细胞,而这些用来区别细胞的蛋白,通常称为标记蛋白

耶鲁公开课 - 生物医学工程探索课程节选

In turn, that can cut C-reactive protein, a marker for inflammation, by up to 40%.

FORBES: Silencing "Syndrome X"

This "biophony, " as Krause calls it, can be studied as a marker of an eco-system's health.

CNN: Meet the man recording the sound of extinction

And he continues to function as a marker of the limits of the entertainment industry's tolerance.

BBC: What Liberace reveals about the march of gay rights