preferential margins优惠: preferential; favourable差额: difference; balance; margin; ...幅度: range; scope; extent; latitu ...优惠差额: margin of preference优惠幅度: margin of preference; preferential margin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:优惠差额, 优惠幅度,即可在微信中查询翻译