hard vacuum tube  高[度]真空管

hard-zinc vacuum furnace  硬锌真空炉

Hard Roof and Hard Coal  两硬条件

Hard Roof and Hard Floor  坚硬顶底板

hard-soft-hard sandwich media  三明治介质

microwave vacuum drying combined with vacuum drying  微波真空与真空联合干燥

non-perturbative QCD vacuum and vacuum condensate  非微扰QCD真空和真空凝聚

vacuum dryer =vacuum drier  真空干燥器

vacuum drying plant and vacuum freeze drying plant  真空干燥设备和真空冷冻干燥设备

(semi) hard process  (半)硬过程

20 m VERY THICK AND MEDIUM HARD SEAM  20m特厚中硬煤层

3 channels hard cholecystoscope  硬质三通道胆囊镜; 加州技术测验

A Good Man Is Hard to Find  商务信息系统; 好人难寻

a hard case  不可救药的人

a hard nut to crack  脑电; 棘手的问题

a hard row to hoe  乏味的工作

a hard sphere unit  硬球单元体

ABCD optical system with internal hard-edge aperture  含硬边光阑ABCD光学系统

Abnormal hard tissue formation in pulp  尿道旁结缔组织良性肿瘤