单词hydraul-
网络: 美国液压学会
hydraul ic pile hammer was a kind of machine , which was widely used in architecture and dock to make base.
打桩锤是用于建筑、码头等桩基础施工的预制桩施工机械。
Lifting and lower of cotton belt by hydraul 1 band electric control . (with 1 unit of hydraulic pump. )
棉织带升降以压油电控操作（即油压机一组）。