I. Introduction
Time-varying delay is an universal phenomenon in a wide variety of practical systems [1]–[3], and even the signals transmitted may come through a few network segments with diverse transmission conditions, resulting in a variety of time-varying delays with different properties, which is a considerable factor leading to system instability [4]–[7]. Considering that merging them together may omit some characteristics of delays, the research on the stability of system with two additive time-varying delays has very important meaning accordingly.