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Two spacewalking astronauts have been able to install a new camera in the Hubble Space Telescope.At first, they had trouble removing the old camera because of a stubborn bolt. 两名在空间行走的宇航员，现已可以在哈勃望远镜上安装新的摄像机，起初，因为一些不灵活的螺钉给去掉旧的摄像机造成困难。