qtd的意思有：1、离散度(QT Dispersion);2、季初至今(Quarter To Date);3、退出到桌面(Quit to Desktop);4、排位赛定期存款(Qualifying Time Deposit);5、四端子位数(Quadruple Terminal Digits)。
短语
1、QTD QUOTED 引述
2、QTdispersion QTd 离散度
例句：
1、Objective To analyze the change of QT dispersion (QTd) during gynecologic celioscope with spinal anesthesia. 目的探讨腰硬联合麻醉行妇科腹腔镜手术气腹前后Q - T离散度的变化。
2、The wagon jolted on, carrying me I knew not whither. . . . Between that earth and sky I felt erased, blotted out" (qtd in the foreword to My Ántonia x). 篷颠簸不断，载着我走向我并不知道的地方，在天空与大地之间，我感到悠闲与玷污。
