The picture was then switched to the Nigeria and West Africa training center. A female trainer introduced herself in fluent mandarin.
2
以尼日利亚拉格斯防波堤修复工程石料开采为例，介绍石料开采爆破设计、施工工艺。
Take the quarrying of the Lagos harbor moles repairing project in Nigeria as example, this paper introduces the blasting design and construction technology.
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