One material can be distinguished from another by their physical properties: color, density, specific, heat and so on. 一种材料与另一种材料的区别在于它们的物理性能:颜色、密度和比热等等。
28. do away with(=get rid of) 除去,废除,取消; do away with (=kill) 杀掉, 镇压
I want them to do away with this feudal custom. 我希望他们废除这一封建陋俗。
Do I have to do away with my habit? 我是不是得改掉我的习惯?
29. haveto do with 与有关系
I thought John must have something to do with this matter.
30. without doubt (=undoubtedly)无可置疑地
in doubt(=in a condition of uncertainty)对表示疑惑
He is without doubt the cleverest student Ive ever taught. 他确实是我所教过的学生中最聪明的。
Always proofread completed letters very carefully. Consult dictionary when necessary or in doubt. 完成的书信一定要很小心地校对,有必要或怀疑时查典。
31. by ear (=play music from memory without having seen it printed) 凭记忆,不看乐谱
have an ear for (=have keen recognition of sounds esp. in music and language)对有鉴赏力
Alan has an ear for music. In my opinion, she will be a great musician one day.
32. on earth 究竟, 到底, 全然
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