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- 四老沟矿11#层402盘区自燃火灾事故的处理Accident Handling of Spontaneous Fire at Panel No.402 Seam No. 11 in Silaogou Mine
- 四老沟矿在复合顶板下锚杆和锚索联合支护Bolting and rope support for composite roof in Silaogou mine
- 四台矿11号煤层307盘区短壁综采开采技术Fully mechanized short-wall mining technology for No. 307 Mining Section in No. 11 Seam of Sitai Mine
- "四老一小"社会医疗保障面临的困境和出路Predicament and Outlet of the Social Medical Care and Safeguard System on the Family of "Four Aged and One Child"
- 四台矿11#层采区巷道顶压分析及巷道支护参数的选择Pressure Analysis of Stoping Area Driving in Seam11%23 of Sitai Mine and Selection of Support Parameters of Driving
- 河滩沟矿综放工作面瓦斯超限治理Gas Controlling of Full-mechanized Sublevel Caving Faces in Hetan'gou Coal Mine
- 黑岱沟矿后续开采工艺的经济合理性初探Preliminary Exploration on Economic Rationalization Concerning After-mining Technology in Heidaigou Open cast
- 白头偕老remain happily married to a ripe old age
- 乳沟cleavage
- 不老的ageless
- 大学英语四级College English Band 4
- 不老young at heart
- 电缆沟cable pit
- 新老the old and new
- 四是fourthly
- 矿难mine disaster
- 深沟球轴承deep groove ball bearing
- 锐钛矿anatase
- 四星four stars
- 张老Zhang Lao
