单词	a happy omen
释义	a happy omen 祥瑞
随便看	effective depty effective descriptive set theory effective design management effective desk area effective devaluation effective development effective development ratio effective development strategy effective deviatoric stress ratio effective deviator stress ratio effective devise effective diameter effective-diameter effective diameter equivalent effective diameter of bellows effective diameter of grain effective diameter of objective effective diameter of picture area effective diameter of pipe effective diameter of pulley effective diameter of soil particle effective diameter of thread effective diaphragm effective diaphragm area effective dielectric constant