On some missions , the shuttle carries a european-built pressurized research facility called spacelab in its cargo bay .
执行某些任务时，飞行器要在它的货物舱带着一种称为太空实验室的欧洲人创造的加压研究设施。
Without relying on wireless communication , spacelab can tell astronauts their altitude by analyzing earth 's curvature , which becomes more pronounced with distance .
