This is the first time the aviation authority utters concrete efforts in such detail concerning flight delays.

这是民航负责人在处理航班延误问题上第一次具体表态。

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Two opposing scenarios, the "arboreal" hypothesis and the "cursorial" hypothesis, have traditionally been put forward concerning the origins of bird flight.

关于鸟类飞行的起源，传统上提出了两种对立的假设：“地栖说”和“树栖说”。

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"Gagarin was aware of the fears concerning zero gravity, and he also knew about all failed launches preceding his flight, " but he never showed any fear or doubt, Ivanovsky said.

“Gagarin清楚对于零重力的担忧，他还知道飞行之前所有失败的发射。” 但是他没有表现出害怕和疑虑，Ivanovsky说到。

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Penny Pfaelzer, a spokeswoman for Korean Air, said the airline received a bomb threat at its Los Angeles call center concerning Flight KE072, which was carrying 134 passengers, a Canadian pilot and 12 crew members.

CNN: Bomb threat causes emergency landing in British Columbia