Miền liên tục
Continuum is a continuous non-spatial whole or extent or succession in which no part or portion is distinct or distinguishable from adjacent parts.
Example 1: time - the continuum of experience in which events pass from the future through the present to the past. (http://www.thefreedictionary.com)
Example 2: ICT teaching continuum with phase I: uncertain/hesitant; phase II: willing but dependent; phase 3: confident and proficient, phase 4: leading and enabling others.