下射水道

... 下潭，下塘：lower pool 下射水道：undersluice 下射式进水闸：undershot type headgate ...

 底部泄水道

... underslope下耳戳 undersluice底部泄水道 underslungalternateplow架下悬挂键式犁 ...

 下泄式水闸

... 下泄式阀门 undershot gate 下泄式水闸 undersluice 下泄热交换器 let down heat exchanger; rcv ...