plain pipe-end

例句：

1. 1. The engineer used a special tool to remove the plain pipe end.
   工程师使用特殊工具来去除直管端。
2. 2. The plumber replaced the plain pipe end with a new one.
   管道工用一个新的直管端替换了旧的。
3. 3. The construction crew had to cut away the plain pipe end before they could start work.
   施工队伍在开始工作前不得不切断直管端。