... 降下的 descensional 降下艇to lower a boat 降下下坡 descend ...
双语例句
1
The sailors began toloweraboat.
水手们开始降低船。
2
A keel also provides weight low under the water tolower the boat's center of gravity below the waterline, which is needed so that the boat bobs back upright if knocked over by wind or waves.