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Others have articulated joints attaching them to the logging tool, with a backup arm to press the pad against the borehole wall.
另有一些极板需要使用连接装置才能和下井仪器相连，测井时需要使用推靠臂才能紧贴井壁。
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Rick stays at the van to backup Jack, but gets clipped in the arm.
里克在车旁边为杰克作支援，但是一只手臂上被射中了一枪。
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