减摇鳍

减摇鳍	jiǎn yáo qí	fin stabilizer (in ships) / anti-roll stabilizer
减	jiǎn	to lower / to decrease / to reduce / to subtract / to diminish
摇	Yáo	surname Yao
摇	yáo	to shake / to rock / to row / to crank
鳍	qí	fin