研究迹映射的几个性质：保测度，可积，可反。

Some properties of trace map are studied, such as exemple measure-preserving, integrable and reversible.

youdao

研究迹映射的几个性质：保测度，可积，可反。

Some properties of trace map are studied, such as exemple measure-preserving, integrable and reversible.

youdao