Dayem达耶姆dayn.白天；一天；时代day fumper ring周历定位(杆)衬套day night cycle全日循环day of due date满期日day arrangement地面设备Day Plane Guard白昼飞机救护舰day night rhythm昼夜节律day of clear sky晴空日day of reckoning(源自《圣经》)清算日； 最后审判日day care nursery日托托儿所day time circuit日间电路