斑马的黑白条纹是一种独特的自然标记。

The zebra's black and white ___markings are a unique natural pattern.

跑道上的标记帮助运动员保持在正确的赛道上。

The ___markings on the track help runners stay in the correct lane.

老师仔细检查了试卷上的批改痕迹。

The teacher carefully reviewed the ___markings on the test papers.