He joined underground activities in 1970.
他于1970年参加了一些秘密活动。
The most common approach to extracting metal-bearing ore from a porphyry copper deposit is by open-pit mining, although such mines also typically include some underground activities.
从斑岩含铜矿床开采含金属的矿石，最主要的方式是露天开采，尽管这种矿床常会伴随一些地下的地质活动。
"If all such activities go underground, they would be more difficult to control," Lee says, potentially opening a greater market for trafficking.
Lee指出，如果所有活动都转入地下的话，监管会更加困难，而且还可能会滋生一个更大的人口贩卖市场。
Marki makes his living as a “mule, ” ferrying clothes from Europe to Havana for sale at three underground stores, and has spent time in jail for his activities.
Marki的生活就像头“骡子”，他从欧洲往哈瓦那的三个地下商店运衣服卖，因此他做了一段时间的牢。
Supervisors in this unit group supervise and co-ordinate activities of workers engaged in underground and surface mining operations and quarries.
本单元组主管监督和协调从事地下和地表采矿作业和采石场工人的活动。
Because of the transaction costs, while engaging in economic activities people are faced with two alternatives: underground economy or overground economy.
由于交易成本的存在，使人们在进行经济活动时，面临着地上经济还是地下经济的选择。
Detection of underground pipelines is of great significance in normal activities.
地下管道的检测，在日常的生产活动中，意义是非常重大的。
So, to build a complete and accurate underground space information system is essential to the activities of planning, design, constructing etc.
因此，建立完备准确地建设地下空间信息对于规划、设计、施工等人类工程活动是至关重要的。
The Underground Plaza is finally the most important element of the project, source of permanent day and night service and tourism activities that enhances and renews the site.
地下广场是该项目最重要的部分， 因为日以继夜的生活服务和各种旅游活动使得这里充满了生机与活力。
The diversion tunnel section excavated by tunneller is buried deeply, the under ground water level is high, the activities of underground water is lively, and Karst topography is quite developed.
采用掘进机开挖的引水隧洞洞段埋藏较深，地下水位高，地下水活动强烈，岩爆频繁，岩溶较为发育。
The paper classified the disaster events induced from underground water level change because of human activities and investigated its causes and prevention measures.
对由人类活动引起的地下水动态变化所诱发的各种类型的灾害事件进行了分类研究；并对其成因及防治措施分别作了探讨。
The"underground economy"is usually termed as informal economic activities, and it is not purely negative as economists assumed from an aspect of institutional economics.
“地下经济”通常被称为非正式经济活动，如果从制度经济学的角度来解释地下经济，那么，它并不是一种完全消极的经济活动。
Central garden will be located on the roof top of underground parking lot. It will be composed by central activities space three special courtyards, semi-private garden and three entrances.
中心园林景观位于地下车库顶板之上，主要由中心活动空间及三个特色组团花园、半公共花园空间及三个入口构成。
But due to the influence of the structural activities and weathering in the surface, under the action of underground water, the ore types and the preservation of ore seam showed obvious zoning.
但由于构造活动及地表风化作用的影响，矿层在地下水的作用下，其保存情况及矿石类型形成了明显的分带性。
The activities related with site selection and site characterization for the repository can be combined with those for the underground research laboratory.
处置库的选址和场址评价工作可与地下实验室研究的相关工作结合。
With series ventilation underground, production activities in many places were running under little or even no airflow. Motor tricycles without explosive-proof quality were used underground.
井下串联通风、多处无风微风作业，使用非防爆机动三轮车。
Through mining activities, we release all kinds of underground metals from the ground, they enter into the daily lives of people and are deposited on the surface of the earth.
但是人们通过采矿的活动，把地底的各种重金属释放出来，进入人们的日常活动中，进而在地球表面沉积。
The underground floor focuses on leisure activities, the sunken space of which forms an open layout. The reception room is more interesting with the use of light Wells and waterscape.
项目共四层，负一层以休闲活动功能为主，通过下沉空间，形成一种全开放式的格局，并利用采光井的优势，设置了水景景观，增加了会客厅的趣味性。
The underground floor focuses on leisure activities, the sunken space of which forms an open layout. The reception room is more interesting with the use of light Wells and waterscape.
项目共四层，负一层以休闲活动功能为主，通过下沉空间，形成一种全开放式的格局，并利用采光井的优势，设置了水景景观，增加了会客厅的趣味性。
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