A naked woman kneels on the rocks of a shallow stream .
A woman kneels in the stream .
A naked woman kneels on the rocks of a shallow stream.
A woman kneels in the stream.
The rocks of a stream are in the stream.  So a woman kneeling on the rocks is also kneeling in the stream.
The rocks of a stream are in the stream . So a woman kneeling on the rocks is also kneeling in the stream .