The fourth-generation theory divides things into four categories-ABCD-according to their urgency and importance.
第四代理论把事情按紧急和重要程度分为 ABCD 四类。
2
Fourth-generation programming languages (4gl) or.
第4代编程语言(4gl)。
3
A device that weighs less than one kilogram is part of a mission that will allow scientists to deliver fourthgeneration or 4G mobile coverage to the moon in 2019.