The psychologists reasoned that if the children knew what they usually looked like, they would be surprised by the unusual red mark and would start touching it.

心理学家推断，如果孩子们知道自己平时的样子，他们就会对这个不寻常的红色标记感到惊讶，并开始触摸它。

youdao

The key fell from her hand. When she took it up there was a red mark on it.

钥匙从她的手里掉了下去，当她捡起钥匙时，发现钥匙上有了一个红记号。

youdao

My bike is the one with a red mark.

我的脚踏车是有红色记号的那辆。

youdao

This past week,volunteers from Red Cross and Red Crescent societies around the world gathered in Solferino to mark the anniversary.

VOA: special.2009.07.01

but I mark the whole paper up with a lot of red ink if there are mistakes,

但我在批论文的时候，也会把语法错误的地方用红笔标出来，

与哲学系教授 - SpeakingMax英语口语达人

But when she turned pale, there was the mark, like a red stain upon snow.

VOA: special.2009.09.26

The teacher tried to get it off with a wash cloth, and it left a red mark on the side of his face.

CNN: What teachers really want to tell parents

Helping one blond girl wash her hands, she notes in alarm a bright red mark on her face, what appears to be a fresh injury.

FORBES: Child Care Director Is Also Diaper-Changer in Chief

"I've been bitten so much I'm used to it, " said Leung, rolling up the sleeve of his oversized blue fleece jacket to reveal a red mark on his hand.

NPR: Hong Kong Poor Living In Cages And Cubicles