请在重要的地方做记号。

Please mark the important parts.

我用铅笔在纸上做记号。

I marked the paper with a pencil.

老师在错误的地方做记号。

The teacher marked the mistakes.

他在书页上做记号以便下次阅读。

He marked the page for next time.

请在地图上做记号。

Please mark it on the map.

你不应该在不属于你的书上做记号。

You shouldn't mark a book which isn't yours.

用红圈将我的错误做记号。

Mark my mistakes with red circles.

后来，科学家开始在鸟的身上做记号。

But after that point, people start to mark animals.

用笔在绳子形成圆圈的两端重叠的地方做记号。

Use a pen to mark the point where the string overlaps to form a circle.

一个做记号的笔-提醒你无论在哪里都要留下好的痕迹。

A marker pen to remind you to leave a good mark wherever you go!