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....
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...
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....