double-walled well

例句：

1. 1.The double-walled well is a crucial component of the water treatment system.
   双层壁井是水处理系统的关键组成部分。
2. 2. The engineers designed the double-walled well to withstand high pressure.
   工程师们设计了双层壁井以承受高压。
3. 3. The double-walled well was used to extract oil from the deep seabed.
   双层壁井被用来从深海床提取石油。