/,ʌn'flægɪŋ; ʌn`flæˇɪŋ/
adj not showing signs of tiredness; untiring 毫无倦容的; 不疲倦的
*unflagging energy, zeal, devotion, etc 充沛的精力、不衰的热情、不懈的奉献精神
* listen with unflagging attention, interest, concentration, etc 全神贯注地、兴趣昂然地、聚精会神地...听着.