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。
MESSENGER is scheduled to fly past Mercury twice more before firing its thrusters to enter orbit in 2011.
2011年在MESSENGER飞船点燃推进器进入水星轨道之前，预计它还将飞越水星两次以上。
They will fly over twice a year, throughout their lives.
它们一年迁行两次，终生如此。
OVER THE FOLLOWING six months Cassini will fly by Titan twice to study the atmosphere and surface of the giant moon and to prepare for the Huygens mission.
在接下来的六个月中，卡西尼将两度飞越土卫 六，以研究这颗巨型卫星的大气和表面，并为惠更斯任务做准备。
OVER THE FOLLOWING six months Cassini will fly by Titan twice to study the atmosphere and surface of the giant moon and to prepare for the Huygens mission.
在接下来的六个月中，卡西尼将两度飞越土卫 六，以研究这颗巨型卫星的大气和表面，并为惠更斯任务做准备。
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