重合

These two lines coincide with each other.

这两条线相。

Observational studyaims at the approach to a dynamic system whose equation is undeterminable.

该方程组的解在有限时段上的采样值与给定序。

Pectose exists in the fleshy pulp of unripe fruit;during the process of ripening it changes to pectin;by cooking, pectin is changed to pectosic acid, and by longer cooking to pectic acid.

果存在于未熟果的肉浆中，在熟过程中它质，在烹饪时质果酸。