adj.无记号的；未被注意的
She handed him an unmarked card. 她递给他一张无标志的卡片。
A few cops prowled in marked and unmarked cars. 几名警察乘坐有标志和无标志的汽车在暗中巡查。
his retirement was not allowed to go unmarked. 他的退休是不容忽略的。
