Three classes are available on the high speed trains: business, first and second. Second class is equivalent to but far more comfortable than economy class on a airplane.
高铁列车座位分三等：商务、一等和二等。二等座相当于飞机上的经济舱，不过舒服多啦。
Pressurizing, continuous and transonic wind tunnel is the first one in our country, and it is the world's first class tremendous high - speed aerofoil wind.
增压连续式跨音速风洞在我国尚属首例，是具有国际先进水平的大型高速翼型风洞。
Pressurizing, continuous and transonic wind tunnel is the first one in our country, and it is the world ' s first class tremendous high - speed aerofoil wind.
增压连续式跨音速风洞在我国尚属首例，是具有国际先进水平的大型高速翼型风洞。
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