block the passage of message

例句：

1. 1. The traffic policeblocked the road to prevent accidents.
   交通警察封锁了道路以防止事故。
2. 2. Theconstruction workers were blocking theroad for the next day's work.
   建筑工人正在为第二天的工作封锁道路。
3. 3. The bridge was blocked bya large tree falling down.
   一座大桥被倒下的大树阻塞了。