I used to travel by air a great deal when I was a boy. My parents used to live in South America and I used to fly there from Europe in the holidays. An airhostess would take charge of me and I never had an unpleasant experience. I am used to traveling by air and only on one occasion have I ever felt frightened. After taking off, we were flying low over the city and slowly gaining height, when the plane suddenly turned round and flew back to the airport. While we were waiting to land, an airhostess told us to keep calm and to get off the plane quietly as soon as it had touched down. Everybody on board was worried and we were curious to find out what had happened. Later we learned that there was a very important person on board. The police had been told that a bomb had been planted on the plane. After we had landed, the plane was searched thoroughly(被彻底搜查). Fortunately, nothing was found and five hours later we were able to take off again.
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从林则徐的“苟利国家生死以，岂因祸福避趋之”，到张謇的“实业救国”；从詹天佑的“各出所学，各尽所知，使国家富强，不受外侮，足以自立于地球之上”，到佟麟阁的“国家多难，军人当马革裹尸，以死报国”这是仁人志士发出的时代最强音。这个时代的特征是(     )