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(表示方位的)标记，路标，记号;（起提示作用的）标示物
A marker is an object which is used to show the position of something, or is used to help someone remember something.
例句
He put a marker in his book and followed her out.
他在书里夹了一个书签后便随她出去了。
...lines of weathered stone markers sticking up from the desert.
矗立在沙漠里的一排排饱经风吹日晒的石头路标
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（品质或特点的）标志，代表
If you refer to something as a marker for a particular quality or feature, you mean that it demonstrates the existence or presence of that quality or feature.
例句
Vitamin C is a good marker for the presence of other vitamins and nutrients in frozen food.
维生素C的存在是冷冻食品里存在其他维生素和营养成分的很好说明。
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记号笔，毡笔(笔头较粗，由毡毛制成，用于绘画和着色)
A marker or a marker pen is a pen with a thick tip made of felt, which is used for drawing and for colouring things.
例句
Draw your child's outline with a heavy black marker.
用浓黑色的毡笔画出你孩子的轮廓。