Using anatomical method, the gonadal development in postembryonic period of Rana chensinensis, which had been migrated from Northeast China, is studied.
Northeast is low-angle slope, develop constructive potamic-lake delta, The delta from headstream to lake, extend very long, sediment complex and Microfacies multiplicity.
Lying as it does in the deep waters of the Western Pacific, Japan winds in and out like a snake from southwest to northeast, a distance of more than two thousand miles.