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。

She improved in health stage by stage.

她的健康状况逐渐好转。

When the pull wire is pulled, the upper climbing body can forwards climb stage by stage.

牵动拉线时，上爬体就会逐级攀登上爬。

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。

The small-sized plane of small town of home of join United States is exiting the market stage by stage.

连接美国国内小城市的小型客机正逐步退出市场。