变深度开沟器的英文

• variable-depth opener

• 变:    become different; change
• 深度:    degree of depth; depth
• 开沟器:    furrow opener; furrower; dri ...
• 开沟器:    furrow opener; furrower; drill boot; colter boot; opener boot; opening share
• 安全开沟器:    trip opener