Then over many more years, the Phosphorus-rich rocks of the new land begin to erode and the cycle continues.
然后过了许多年,含磷丰富的新陆地岩石开始被侵蚀,而且循环还在继续。
2
The central state, though often very rich and very populous, was intrinsically fragile, since the development of new international trade routes could undermine the monetary base and erode state power.