The transition from this period into a more independent one is challenging and exciting, both for us and our parents.

transition 是名词，来自动词 transit（过渡、通过），由前缀 trans-（表示"跨越、穿过"）和词根 it（表示"走"）组成。transition 指"从一个状态或阶段到另一个状态的转变过程"。