clogged lines

例句：

1. 1. The cables in the electrical system were all clogged with dust.
   电气系统中的电缆都积满了灰尘。
2. 2.The engineers had to clear the blocked lines before they could begin work.
   工程师们必须先清理堵塞的线路才能开始工作。
3. 3.The old telephone line was clogged and took several hours to unclog.
   旧的电话线路被堵塞了，需要花费几个小时才能疏通。