大多数火箭有多级设计，在火箭上升过程中逐级分离。

Most rockets have multiple ___stages that detach as the rocket ascends.

这个计划还处在初步阶段，我们需要更多讨论。

The plan is still in the early ___stages, so we need more discussions.

乐队成员走上舞台开始表演。

The band members stepped onto the ___stage to start their performance.

他们计划在下个月举办一场慈善音乐会。

They plan to ___stage a charity concert next month.