blank pipe

例句：

1. 1. The engineer used a blank pipe to connect the two pipes.
   工程师使用一根空管将两根管子连接起来。
2. 2.The construction crew had to replace the blank pipe with a new one.
   建筑工人不得不用一根新的空管替换掉原来的那根。
3. 3. The old pipeline was replaced with a blank pipe to prevent leaks.
   为了预防泄漏，旧的管道被一根空管所替代。