He headed the ball to the unmarked Gray.

他把球顶给了无人盯防的格雷。

《牛津词典》

He had seen them come out and get into the unmarked police car.

他看见他们出来了，进了没有标志的警车。

《柯林斯英汉双解大词典》

Analysis of the unmarked passive sentence.

对无标记被动句的分析。

youdao

Though a large percentage of those victims are yet to be identified, DNA testing is making it increasingly possible to determine the identity of remains found in unmarked graves.

VOA: standard.2009.12.18

Bolton's early optimism had been dented within 10 minutes as they failed to pick up the unmarked Villa captain.

BBC: Aston Villa 4-0 Bolton

The unmarked police Land Rover was not driven by the chancellor at any point, added the source.

BBC: George Osborne 'unaware' his car was parked in disabled bay

The road immediately behind this end of the complex forms the unmarked border between Monaco and France.

BBC: Stade Louis II