专家们说，模拟持续保持优势的原因主要是围绕升级的成本以及有关物理安全部门网络技术知识的缺乏。
Experts say the reasons for analogue's continued dominance centre mainly around upgrade costs and a general lack of knowledge about networking technologies in many physical security departments.
船级社以其非常专业性的船舶技术知识在保障船舶航行安全方面起着独特的作用。
Classification Society performs a vital role for the safety of life and wealth at sea with its professional knowledge.
第二章对LPG运输、装卸进行了系统归纳，为船舶安全运输提供了必要的技术知识。
The second chapter makes a systemic conclusion in the shipping and handling of LPG, which provides necessary shipping techniques to transmit LPG in the security conditions.
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