The pipe racks are moved to and from their stored position by a hydraulic cylinder attached between the mast frame and the lower swing arm.

管架是通过一个装在支架框和下摇动臂之间的液压缸往返于其贮存位置的。

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Besides the high mast, it has an "arm" that can go even higher and carries another camera.

CNN: Curiosity opening Martian frontier?

It is using its mast-mounted colour cameras and laser spectrometer, together with its arm-held "hand lens" camera and X-ray spectrometer, to try to find the best drill candidate.

BBC: Curiosity Mars rover deploys its rock brush