It was set up comprehensively as far as Song Dynasty.Dongjing is the most emblematical deputation. 可以说，经过隋唐五代的逐步开放，直到北宋时期，才在城市中有了广泛的设置，当时的都城东京是最为典型的代表。
NATURE's THE SEEDY SIDE OF PLANTS rips the husk off the many remarkable ways plants make sure their offspring are spread far and wide. 大自然植物隐秘的一面揭露了很多值得注意的地方，那就是植物确保他们的后代广泛的传播。
