Butterfly forward movement is caused by arm pull and hip movement upwards.

蝶向前是靠拉臂上提臀促成。

youdao

There shall be no kick , arm pull , or floatation that is independent of the turn.

这时将没有踢腿、划臂或者与转身无关的漂浮。

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The head may be submerged after the last arm pull prior to the touch, provided it breaks the surface of the water at some point during the last complete or incomplete cycle preceding the touch.

在触壁前的最后一个划水动作结束后，头可以潜入水中。但在触壁前最后一个完整或不完整动作周期中，头的某一部分应露出水面。

youdao

When the woman trailed behind her companion, he would grab her by the arm and pull her along, Knight said.

BBC: US & Canada

If all goes well, astronauts Donald Pettit and his partners, observing and filming the capsule from inside the station, are supposed to manipulate a roughly 50-foot robotic arm to grab and pull the capsule into a docking port.

WSJ: SpaceX Craft Rehearses Moves

By his mid-20s he had mastered doing pull-ups with one arm, or with 140lb of weights.

ECONOMIST: John Bachar, free-climber, died on July 5th, aged 52