These newproperties are expressed in terms of the properties of arid relationships between the levelset, the upper level set, the relative interior, and the relativeboundary of the upper levelset.
这些新性质是用水平集、上水平集及其相对内部、相对边界的性质与它们之间的关系来表述的。
2
This kind of boundary is relative, only has the temporary stability and the validity, it along with situation change, but unceasing vicissitude.
这种边界是相对的，仅具有暂时的稳定性和有效性，它随着情境的变化而不断变迁。
3
Then, the criteria for the identification of absolute and relative drainage boundary are discussed respectively.