Terms for subject Nautical containing 凹

Chinese	English
凹体	recess
凹度空心度	hollowness
凹槽腐蚀	recess corrosion
凹痕	depression
快速泄水凹体	quick-draining recess
根部凹陷	root concavity
水密凹体	watertight recess
管道凹穴	pipe recess
钻井凹槽	drilling slot
防喷器凹形区	B. O. P. stack recess storage