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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
