On the surface of this sea fan, there are two polyps that are not polyps. 在这株海扇上,有2只"珊瑚虫"不像珊瑚虫
and, as he begins to tire, she supports him close to the surface so that he can breathe more easily. 疲劳的幼鲸被妈妈托上浮上水面好让它呼吸空气
Amoeba like slime molds cruise the surface, feeding on bacteria and rotting vegetation. 象这种粘菌类变形虫正在地表上巡航 它们以细菌和地衣为生
With little or no soil to retain the water on the surface of the land 由于几乎没有土壤保留地表水分
Hot winds suck all the moisture from the surface of the land. 热浪抽干了地面上所有的水分
where there is a network of blood vessels close to the surface of the skin 那里的血管网比较贴近皮肤表层
The only escape is below the surface. 唯一的藏身之处当然是在沙子下面
Dunes of sand hundreds of miles long streak their surface. 绵延数百英里的沙丘像是一条条皱边花纹