NASA envisions a crew of six astronauts for a Mars mission.
美国宇航局设想由6名宇航员执行一次火星任务。
We had a crew list of six, "he said," but I count only five heads.
船员名单上有六人，“他说，”但我数只有五个。
No trace has ever been found of the six planes or the 27-crew members.
没有六架飞机和27个机务人员的任何踪迹。
No trace has ever been found of the six planes or the 27-crew members.
没有六架飞机和27个机务人员的任何踪迹。
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