unmarked
adjective uk/ʌnˈmɑːkt/ us/ʌnˈmɑːrkt/
无标志的，无记号的
having no signs or marks showing what something is
an unmarked police car 一辆无标志的警车
She died penniless and was buried in an unmarked grave. 她死的时候身无分文，被埋在一处无名坟墓里。
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