求翻译：早在20世纪70年代由于爆发了两次大规模的能源危机，出于能源安全战略的考虑，压缩天然气汽车引起了广泛的重视，许多发达国家都在积极研究并早已开发利用是什么意思？

As early as the 1970s, two large-scale outbreak of the energy crisis, energy security strategy for consideration, compressed natural gas vehicles has attracted wide attention in many developed countries are already active research and development and utilization of

As early as the 1970s were two large-scale owing to the outbreak of the energy crisis, energy security, and strategic considerations of compressed natural gas vehicles has given rise to widespread attention, many developed countries have been actively engaged in research and development and use long

As early as in 20th century 70's because erupted two large-scale energy crises, stemming from the energy security strategy consideration, the compression natural gas automobile has brought to the widespread attention, many developed countries all positively are studying and already develop the use

As early as in the 1970 of the 20th century because of two large-scale energy crisis broke, out of energy strategy considerations, compressed natural gas vehicle attracted the attention of broad, many developed countries are active in research and development and utilization of already

As early as in 20th century 70's because erupted two large-scale energy crises, stemming from the energy security strategy consideration, the compression natural gas automobile has brought to the widespread attention, many developed countries all positively are studying and already develop the use