1. a sheet of unmarked paper.
   一张没有做记号的纸。
2. an unmarked police car.
   一辆没有标志的警车。
3. an unmarked police car; unmarked merchandise.
   没有标志的警车；未带商标的商品
4. She handed him an unmarked card.
   她递给他一张无标志的卡片。
5. the word ‘drake’ is semantically marked as masculine; the unmarked form is ‘duck’.
   单词‘drake’的语义标记为阳性；其未标记形式为‘duck’。
6. an unmarked plane had been making passes over his house.
   一架无标志的飞机在他房子上空飞来飞去。

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