双向滚珠螺旋致动机构的英文

re-circulating ball-bearing screw mechanism

• 双向:    two-way
• 滚珠:    ball
• 螺旋:    corkscrewspin; scr ...
• 致:    deliver; send; ext ...
• 动机:    motive; intention; ...
• 构:    construct; form; c ...