tax disc

劍橋詞典

in some countries , a small , round sign that you put in the corner of the front window of your car or other vehicle to show that you have paid the tax to use it
圓形稅訖證明（貼在機(jī)動(dòng)車的擋風(fēng)玻璃上，表示該車輛的路稅已付） 返回 tax disc