The police are building up a picture of the incident stage by stage.

警方正逐步摸清那次事件的经过。

《牛津词典》

She improved in health stage by stage.

她的健康状况逐渐好转。

youdao

Therefore, image quality and radiation protection is being concentrated stage by stage in the world.

为此，影像质量与辐射安全防护问题越来越受到人们的普遍关注。

youdao

We've done it stage by stage and eventually we have secured promotion which is great.

BBC: SPORT | Football | My Club | Norwich | Worthy cause for a party

The stem cells were taken from these and, in a laboratory culture, and body chemicals used to "persuade" them to shift, stage by stage, from this state into the type of brain cells that their Parkinsonism mice were lacking.

BBC: NEWS | Health | Mouse cloned to cure Parkinson's

He would not say whether he thought at some stage that the police would be able to press charges, Mr Yates said they had "built the case stage by stage on the evidence" and handed it to the CPS to make the final decision.

BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing