entrance block

例句：

1. 1. The new security systemhas made it much easier to enter thebuilding.
   新的安全系统使得进入大楼变得非常容易。
2. 2. The construction workers had to clear anentrance blockage before they could start work.
   建筑工人在开始工作之前不得不清除一个入口障碍。
3. 3. The police blocked the entranceto prevent further trespassing.
   警方封锁了入口以防止进一步的非法入侵。