South Korean pilots, averaging six or seven hours a week in the air, say their North Korean counterparts, flying older model MiGs, are lucky to fly once or twice a month.
南韩飞行员每周平均有六到七小时上天的机会，但他们的北方同行只能驾驶古老的米格战机，一个月或许才能有幸飞上一两次。
"I purchase luxury bags or perfume in the Sanya duty free shop because I get the opportunity to fly there twice a year for business," said Chen Ping, a sales in Beijing.
“因为我每年有两次去三亚出差的机会，所以会在那里的免税店购买名牌包和名牌香水”在北京从事销售工作的陈平(音译)说。
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。
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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