由于缺乏大气的保护，月球在它存在的45亿年间遭受了强烈的撞击。
The absence of a protective atmosphere means the moon has been subjected to intense bombardment in its 4.5 billion-year existence.
因为缺乏空气和水，所以(人们)在月球上居住是不可能的。
The absence of air and water makes it impossible to live on the moon.
LCROSS探测器，对月球环形山观测和传感卫星，上周推出，也有任务目标，以确认在接近月球极阴影中的环形山的存在或缺乏的水冰。
LCROSS, the lunar crater Observation and Sensor Satellite, launched last week, has a mission objective to confirm the presence or absence of water ice in a Shadowed crater near a lunar pole.
LCROSS探测器，对月球环形山观测和传感卫星，上周推出，也有任务目标，以确认在接近月球极阴影中的环形山的存在或缺乏的水冰。
LCROSS, the lunar crater Observation and Sensor Satellite, launched last week, has a mission objective to confirm the presence or absence of water ice in a Shadowed crater near a lunar pole.
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