He placed a marker where the ball had landed.(他在球落地的地方放了个标记。)
Could you give me a marker, please?(请给我一只记号笔，好吗？)
Can you pass me the red marker?(你能递给我那个红色的马克笔吗？)
Where is your marker?(你的记号笔在哪里？)
Researchers measured people's cortisol, which is a stress marker, while they were at work and while they were at home and found it higher at what is supposed to be a place of refuge.(研究人员测量了人们在工作时和在家里时的皮质醇（压力的一种标志）状态，结果他们发现在家里——这个原本应该是安身之所的地方——皮质醇含量更高。)
Using a Magic Marker, he wrote seven digits on the poster-size banner.(他用白板笔在海报大小的横幅上写了七个数字。)
He put a marker in his book and followed her out.(他在书里夹了一个书签，就随她出去了。)
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