花园里万紫千红，鸟鸣嘤嘤。The gardens blazed with colour and throbbed with birdsong.鸟鸣报晓.The singing of the birds heralded in the day.鸟鸣声不时打破林中的寂静.Now and then a bird's song broke in upon the silence of the wood....
A research is madethe properties of compound cement consisting of Alite - sulphoaluminate cement and Portland cement.研究了阿利特 - 硫铝酸盐水泥与硅酸盐水泥复合所制备的水泥的性能....