Centreboard
n. 船底中心垂直升降板, 装有升降板的小船
📖 牛津释义
centreboard
n moveable board that can be raised or lowered through a slot in the keel of a sailing-boat to prevent drifting 中插板（船底中心防止船漂移的垂直升降板）. =>illus at dinghy 见dinghy之插图.
🗣️ 情景例句
One is as old as one's heart.
心多老人多老。
Mills of God grind slowly but sure.
天网恢恢，疏而不漏。
Not to grasp firmly is not to grasp at all.
抓而不紧等于不抓。