最近，国际空间站上的宇航员使用安装在轨道实验室上的大型58英尺长机械臂，完成了一次例行的“行走”机动。
Recently, the astronauts on board the International Space Station performed a routine "walk-off" maneuver with the large, 58-foot-long robotic arm attached to the orbiting laboratory.
这条机械臂由加拿大航天局提供，名为Canadarm2（加拿大机械臂2号），堪称现代工程奇迹。由于两端基本相同，它能够像尺蠖一样灵活地沿大型空间站外部移动。
The robotic arm, known as Canadarm2 because it was supplied by the Canadian Space Agency, is something of a modern engineering miracle—it can effectively move around the exterior of the large space station like an inchworm because both ends are essentially identical.
然而，在此次“行走”机动完成后，机械臂以及用于沿空间站主桁架引导其移动的移动平台都无法再被移动。
However, after this particular walk-off maneuver, the robotic arm, along with the mobile transporter that guides it along the main truss of the space station, could no longer be moved.