本期内容：

NASA believes it has fixed a malfunction with the Hubble telescope which threatened to limit the orbiting observatory's performance. Earlier this month, one of Hubble's gyros - needed to point the spacecraft - failed, forcing controllers to place the telescope in "safe mode" - where it operates with essential functions only. This was required because a backup gyro also malfunctioned when switched on. But after a series of tests, the backup appears to be working normally.

malfunctionvi. 功能失常
orbit: vi. 绕轨道运行
observatory: n. 观察站；天文台
gyro: n. 陀螺仪；回转仪
gyroscope: n. 陀螺仪；回转仪
point: vt. 指明方向
spacecraft: n. 宇宙飞船
aircraft: n. 飞机；飞行器
place: vt. 安置
backup: n. 备用；替补
switch on: 开启

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