Upper roller lower roller是什么意思

Upper roller lower roller是什么意思 lower upper off lower&upper 在烤箱上的 upper and lower case letters and numbers. 英语翻译words in upper and lower-case letters什么意思 upper canada 和 lower canada 有什么区别, lower canada upper canada 叛乱的意义 significance of rebellions Parallel upper,Parallel lower在模具里是什么意思? your upper teeth and lower teeh meet at the middle, 英语翻译upper and lower sidebandsupper and lower side frequenciespeak change in the amplitude of the envelope roller ROLLER upper upper upper upper upper 谁能解释upper Canada和lower Canada的区别!英文版的!谁能解释upper class和lower class的区别!英文版的! 如何理解这个英语句子?They have to distinguish between words in upper and lower-case lettersin upper and lower-case letters这个是大小写字母的意思？