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

(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

abrasion-resistent plate by hard bead welding  硬堆焊耐磨板

Acicular hard coke  针状焦

acid coagulated hard cheese  酸凝硬质干酪

acid pump of hard porcelain  硬瓷耐酸泵

ACO-hard  计算机辅助工艺设计

ACO-hard and ACO-easy problems  ACO-难易问题