We fly between Rome and Paris twice daily.
我们每天有两次航班穿梭于罗马和巴黎之间。
The jet can fly at twice the speed of sound.
这喷气式飞机能以两倍于音速的速度飞行。
The aim is to fly at about Mach 2, twice the speed of sound.
目标是以大约2马赫的速度飞行，也就是音速的两倍。
They will fly over twice a year, throughout their lives.
它们一年迁行两次，终生如此。
They will fly over twice a year, throughout their lives.
它们一年迁行两次，终生如此。
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