N ASA has revealed three concept designs for quiet, energy efficient aircraft that potentially could be ready for flight as soon as 2025.
美国国家航空航天局最近公布了三款在未来2025年人们乘坐的飞机设计图，这三款飞机比现在的客机更安静、而且更加节能高效。
N ASA has revealed three concept designs for quiet, energy efficient aircraft that potentially could be ready for flight as soon as 2025.
美国国家航空航天局最近公布了三款在未来2025年人们乘坐的飞机设计图，这三款飞机比现在的客机更安静、而且更加节能高效。
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