记录器（用以记录两个变量间的关系）的英文

x-y recorder x-y

• 记录器:    describer; documen ...
• 用以:    use sth. to achiev ...
• 记录:    take notes; record
• 两:    two
• 变量:    variable; variable ...
• 间:    space in between; ...
• 的:    4次方是 The fourth po ...
• 关系:    relation; filiatio ...