陶瓦地板使这个地方给人一种非常舒适温馨的感觉。The terracotta tiled floor gives the place a wonderfully homely character.城墙下的住宅区, 窄小的鹅卵石铺成的街道两旁是石灰粉刷、陶瓦盖顶的房屋.In the residential area below, narrow cobblestone streets are lined with whitewashed ho...
赤霉酸也可加强雄性的倾向.Gibberellic acid may also accentuate the trend toward maleness.只有雄性的寒蝉在夏末秋初时鸣叫.Only male cicadas chirp in late summer, and early autumn.美洲野鸭雄性的头冠为白色.American widgeon the male of which has a white crown....
The collapsar model of gamma - ray bursts.γ射线爆发的黑洞模型.The collapsar model of gamma - ray bursts. Click on the image to view a 5 MB animation.γ射线爆发的黑洞模型. 那个5MB动画下载见下一楼....