equation of n th order次: order; sequence方程: equation二次方程: binomial equation; quadratic equation; quadraticequation; quadric equation二次方程的: quadratic二次方程式: quadratic equation下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:次方程,即可在微信中查询翻译