"The European Service Module is so important - we basically can't get to the Moon without it," says Sian Cleaver, a spacecraft engineer at Airbus.
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Thinking Step 2: 推理第一个人。如果他不想要，他会直接说“不”（因为只要有一个不要，全称命题为假）。他说“不知道”，说明他自己想要，但他不确定后面两个人想不想要。