Heads Up Display显示 Department of Housing & Urban Development (US government)住房和城市发展(美国政府) Human Urine Derivative人尿衍生物 Head Up Display抬头显示，前窗玻璃映像显示 (Department of) Housing and Urban Development(美国)住房和城市发展部 Hospital Unit Dose医院的单位剂量 Hold-Up Depth深度? Department of Housing and Urban Development住房和城市发展部 Housing And Urban Development住房和城市发展部 Hiding Under Desks躲在桌子