经常造成混淆的是测试阶段的飞机往往被误以为是正式服役的机型。
What was often confusing was that the service-test jets would be mistaken for operational aircraft.
今年春天，海军已经正式取消了禁止女性在潜水艇上服役的禁令。
The Navy officially lifted the ban on women serving aboard submarines in the spring.
现年9岁的比利已服役7年，它的职责是作为吉祥物“带领”整个军营参加各种正式仪式。
Billy, aged 9, was the unit's mascot for 7 years. It usually marched in front of the battalion in all ceremonial duties.
近几年，波音公司似乎将全部精力投在了严重难产的中型机型787的开发中，该机终于在今年夏末正式服役。
The company seems to have focused all its energy in the last few years in launching its much-delayed mid-sized 787 aircraft, which finally enters service at the end of the summer.
战神火箭暂计划于2015年正式服役，然而一份有影响力的评估报告对NASA的人类太空计划前景表示了怀疑。
The Ares rocket is tentatively scheduled to be in service by 2015 but an influential review of Nasa's human spaceflight programme has cast doubt on its future.
战神火箭暂计划于2015年正式服役，然而一份有影响力的评估报告对NASA的人类太空计划前景表示了怀疑。
The Ares rocket is tentatively scheduled to be in service by 2015 but an influential review of Nasa's human spaceflight programme has cast doubt on its future.
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