这个城市是一个快速发展的科技中心，吸引了很多年轻专业人士。

This city is a ___fast-growing tech hub that attracts many young professionals.

这些快速生长的竹子能在短短几个月内形成一道天然的绿色屏障。

These ___fast-growing bamboos can form a natural green fence within just a few months.