penstock on downstream dam surface

例句：

1. 1. The penstock is crucial for the operation of the dam.
   水力涡轮机对大坝的运行至关重要。
2. 2.The engineers were able to install the penstock in record time.
   工程师们能够以创纪录的时间安装水力涡轮机。
3. 3.The penstock was designed to efficiently transfer water from the reservoir to the power plant.
   水力涡轮机被设计成从水库高效地将水输送到发电站。