在手和臂入水后，仍继续在头前沿着身体的中线延伸。 向后推臂的动作从在前方抓（抱）水开始，然后向下向后推至身体的中线，这时划水的手臂几乎要碰到自己的腹部。
He continue to extend his hand and arm after they enter the water, upstretch in front of his head, along the center line of his body.
她手撑在我肩上，把我推在一臂远的地方，“让我看看你。
She pushed me away and held on to my shoulders at arms length. "Let me look at you.
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。
Others have articulated joints attaching them to the logging tool, with a backup arm to press the pad against the borehole wall.
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