The police have issued an appeal for witnesses.

警方发出了寻找目击证人的呼吁。

《牛津词典》

For instance, new technologies that are building upon existing technology have not found their footing well enough to appeal to a mass audience.

例如，建立在现有技术基础上的新技术还没有建立足够的基础来吸引大众。

youdao

I know a number of parents have rung the headteacher about what has happened but I would appeal for everyone to be calm,.

我知道很多家长都打电话给校长询问发生了什么事，但我呼吁大家保持冷静。

youdao

He is gong to die." Many close to the case in Britain were disappointed last week when Megrahi dropped his appeal, which would have allowed for a review and examination of the evidence.

VOA: standard.2009.08.24

in the last year we've had the decision the BBC wouldn't broadcast the conference against climate change because they thought it was too partisan, wouldn't have an appeal for the fund for the victims in Gaza, but is quite prepared to give Nick Griffin prime time TV,".

VOA: standard.2009.10.23

Even with financial support pledged from Europe and the IMF, Cyprus may likely soon have to appeal for further support to stay afloat.

FORBES: What does an Israel-Turkey Awakening Mean for Mediterranean Gas?

Officers have renewed their appeal for four people who may have vital information to come forward.

BBC: Brighton CCTV image

Police investigating a triple murder have renewed their appeal for information on what would have been the ninth birthday of one of the victims.

BBC: Sharkey fire murders: birthday appeal issued