◁think▷I need to write a 50–80 word English description of the composite LF-NMR image of apple #72, focusing on internal moisture distribution, tissue structure, signal intensity, and patch morphology. I should avoid certain forbidden words and not output JSON, Chinese, or extra explanations.

Let me analyze the image and think about what I can describe:

The image shows four circular sections of an apple, likely cross-sectional slices. Each section shows variations in gray-scale intensity, which probably corresponds to different moisture levels and tissue densities.

Key elements to describe:
1. Internal moisture distribution: The varying shades of gray likely indicate areas with different moisture content. Darker areas might be drier, while lighter areas could be more moist.
2. Tissue structure: The texture differences between the sections suggest variations in the apple's internal structure, possibly indicating different growth stages, areas of damage, or natural variations.
3. Signal intensity: In LF-NMR (Low-Frequency Nuclear Magnetic Resonance) imaging, signal intensity correlates with water content and tissue properties. Brighter areas might indicate higher water content or different tissue characteristics.
4. Patch morphology: The image shows distinct patches or regions with different characteristics. Some areas appear more uniform, while others have irregular patterns or spots.

I need to be careful not to use forbidden words like "healthy", "diseased", "mild", "severe", "normal", "abnormal", or "ground-truth". I should focus purely on descriptive observations.

Now I'll craft a concise description that covers these aspects without using forbidden terms or going over the word limit.◁/think▷The composite LF-NMR image of apple #72 displays distinct variations in internal moisture distribution across its cross-sectional slices. Signal intensity differences suggest heterogeneous tissue composition, with brighter regions indicating localized areas of higher water content and darker zones corresponding to drier tissue. Patch morphology reveals irregular patterns, with some sections exhibiting uniform texture while others display clustered structures and subtle spot-like variations. The imaging highlights natural internal heterogeneity without visible signs of external damage or uniform structural patterns.