Diatomaceous earths are the skeletal remains of the tiny aquatic plants deposited centuries ago.硅藻土是百年前水生植物沉淀下来的遗骸.Belts of mountains are cause by movements in the earths crust.山丘带是由地壳移动而形成的.Rare Earths Group of South an...
The shell surrounding the egg has many important functions.蛋壳有许多重要的功能。The hype and fervour surrounding the event positively invited scepticism.围绕这件事的大肆渲染和热情必然会引起人们的怀疑.The ship came slowly into the harbour, dwarfing all t...