It was just an ordinary voice, but he sang in tune.他声音很一般，但唱得都在调子上。At tea-time, Victoria sang duets with her Consort, Prince Albert.喝下午茶的时候，维多利亚与其夫君艾伯特亲王表演了二重唱。Caroline sang two verses and the chorus of her song.卡罗琳唱了她歌曲...
a kilometre and a half of bitumen一公里半的柏油路面contain bitumen含沥青The irradiation stability of bitumen and bituminized producthas been investigated.本文研究了沥青及沥青固化产品的辐照稳定性.The article introduced the category of natural bitumen an...