The extra time in space also gives the GRAIL spacecraft time to vent gases that could impact their science measurements.
在多出来的时间，GRAIL太空飞船就有充足时间排空气体保证他们的科学测量不受影响。
NASA's Gravity Recovery and Interior Laboratory, or GRAIL, mission spacecraft will orbit the moon before landing on the lunar surface.
美国航天局的重力恢复与内部实验室计划，又称“圣杯”号月球探测器将首先环绕月球轨道飞行，然后在月球表面着陆。
the GRAIL mission, twin spacecraft due to measure the Moon's gravitational field;
还有“圣杯”的使命，孪生的飞船将会测量月球的重力场；
the GRAIL mission, twin spacecraft due to measure the Moon's gravitational field;
还有“圣杯”的使命，孪生的飞船将会测量月球的重力场；
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