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@李永乐老师：这两天飞机事故比较多，先是四川航空挡风玻璃脱落，今天又有古巴空难。...
source link: https://weibo.com/tv/v/GhlJArQck?fid=1034%3A60defca4a24477e8a04ea712a67d05fa
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@李永乐老师：这两天飞机事故比较多，先是四川航空挡风玻璃脱落，今天又有古巴空难。不过飞机依然是世界上最安全的交通工具。你知道历史上最大的空难是哪一起吗？坐飞机什么时候最不安全呢？空难的原因有哪些呢？
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