Tuesday's launch will mark a milestone for NASA's Constellation program, which includes Ares I and the Orion crew capsule planned to fly atop it.

周二的发射将会是NASA星座计划的一个里程碑，除战神1号外，星座计划还包括了搭载在战神1号火箭上的猎户太空舱。

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The findings mark a milestone in an unlikely new animal model for understanding the biology of aggression and how the nervous system gives rise to different behaviors.

这个发现成为里程碑性的标志，它为攻击行为的生理学研究和神经系统是怎样引发不同行为的研究提供了可能的新型动物模型。

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To mark the milestone, workers there surprised him with a special gift—a large ice cake filled with delicious fish.

为了纪念这一里程碑，那里的工人们给了他一个特别的礼物——一个大的冰蛋糕，里面装满了美味的鱼。

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"And today I return to Columbus to mark a milestone on the road to recovery: The 10,000th project launched under the Recovery Act.

VOA: standard.2010.06.18

Many come to mark a milestone, such as the celebration of a new marriage or the survival of a health scare.

NPR: A Pilgrimage to the Taj Mahal, a 'Poem in Stone'

And today, I return to Columbus to mark a milestone on the road to recovery: the 10, 000th project launched under the Recovery Act.

WHITEHOUSE: A Summer of Recovery Act Projects

The 50th Reunion Tour was designed to be a set tour with a beginning and an end to mark a special 50-year milestone for the band.

CNN: By Denise Quan,