increase resources for road safety;
增加道路安全资源；
Valley ecological environment safety is the key to the guarantee of water resources.
流域生态环境安全是保证水资源的关键。
School of Resources and Safety Engineering, Central South University; 2.
中南大学资源与安全工程学院；
School of Resources and Safety Engineering, Central South University; 2.
中南大学资源与安全工程学院；
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