◁think▷I need to write a 50–80 word English description of the composite LF-NMR image of apple #504, focusing on internal moisture distribution, tissue structure, signal intensity, and patch morphology. I should avoid certain prohibited words and not use JSON, Chinese, or extra explanations.

Let me analyze the image:
- The image shows four cross-sectional views of an apple
- The top two images show a more detailed view of the apple's core and surrounding tissue
- The bottom two images show a more zoomed-in view of specific areas
- The grayscale tones suggest variations in signal intensity
- There appear to be variations in tissue structure, with some areas appearing more granular or dense
- There may be moisture variations affecting the signal intensity

Now, I'll craft a description that highlights:
1. Internal moisture distribution (areas of higher/lower moisture)
2. Tissue structure (how the apple's tissues appear)
3. Signal intensity (how the LF-NMR signal varies across the image)
4. Patch morphology (the shape and pattern of any patches or areas)

I'll avoid the prohibited words and keep it concise.◁/think▷The composite LF-NMR image of apple #504 reveals distinct internal moisture distribution patterns. Signal intensity varies across tissue regions, with denser areas showing stronger responses. Tissue structures appear heterogeneous, featuring both granular and more homogeneous zones. Patch morphology is evident in specific regions, displaying irregular shapes with varying edge definitions. The lower images highlight concentrated moisture variations within particular tissue clusters, while the upper images capture broader structural organization.