hydroplane
n
1 light motor boat with a flat bottom, that can travel fast over the surface of the water 机动平底快艇.
2 device on a submarine enabling it to rise or descend (控制潜艇升降的)水平舵.
🗣️ 情景例句
Have a nice stay.
希望你们住得愉快。
To know how to wait is the great secret of success.