维护与开拓客户关系以有效推广设备应用的英文

maintenance and develop customer relation to promote products of rig effectively

• 维护:    safeguard; defend; ...
• 与:    take part in; part ...
• 开拓:    open up; reclaim; ...
• 客户:    connection; custom ...
• 关系:    relation; filiatio ...
• 以:    use; take
• 有效:    effective; valid; ...
• 推广:    popularize; spread ...
• 设备:    equipment; device; ...
• 应用:    apply; use; applic ...