With arms straight,rock forward,pressing down on the lower half of the ribs这里rock是什么意思,如果当动词摇动讲,为什么要用动词原形形式.

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Witharmsstraight,rockforward,pressingdownonthelowerhalfoftheribs这里rock是什么意思,如果当动词摇动讲,为什么要用动词原形形式.Wit

With arms straight,rock forward,pressing down on the lower half of the ribs这里rock是什么意思,如果当动词摇动讲,为什么要用动词原形形式.
With arms straight,rock forward,pressing down on the lower half of the ribs
这里rock是什么意思,如果当动词摇动讲,为什么要用动词原形形式.

With arms straight,rock forward,pressing down on the lower half of the ribs这里rock是什么意思,如果当动词摇动讲,为什么要用动词原形形式.
是动词,"摆动"的意思.
是祈使句,所以动词原形.
With arms straight,和 pressing down on the lower half of the ribs是状语.

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