奔忙

例句：

1. 1. Sheis always busy with her work.
   她总是忙于工作。
2. 2. The city is bustling withactivity.
   这个城市繁忙活跃。
3. 3. Hewas so busy that hedidn't have time toeat dinner.
   他太忙了以至于没有时间吃晚餐。