phase

/feɪz/

any distinct time period in a sequence of events

中文释义：阶段；时期

The project is currently in the planning phase, which will last for three months.

该项目目前处于规划阶段，将持续三个月。

Children often go through a rebellious phase during their teenage years.

孩子在青少年时期通常会经历一个叛逆阶段。