At the same time, other treatments of Riemannian geometry are available at varying levels and interests,so I need not introduce everything.

• 而中方记载，因多为防御战和溃败，资料极其匮乏，尤其是日方损失和战斗细节，不是编造就是阙如，日方资料正可丰富这方面的记载。