Definition
to delineate the shape or position of an object by encircling it with a line
绘出；标示出
The teacher marked out the key points of the lesson on the blackboard.
老师在黑板上标示出课程的重点。
They marked out the route for the trip on the map.
他们在地图上标出了旅行的路线。
For safety reasons, warning signs should be marked out around the construction area.
为了安全起见，应该在施工区域周围标示出警告标志。