Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Snow Cover

积雪覆盖

The graph of snow-cover area is sketched from data in Collins, et al. The images of snow-cover above are NASA images from http://earthobservatory.nasa.gov . They were derived using data from the Moderate Resolution Imaging Spectroradiometer (MODIS), flying aboard NASA's Terra satellite. The two maps represent maximum snow cover in North America during the same 8-day period in 2001 and 2004. .

雪覆盖面积的图是根据Collins等人提供的数据绘制的。上方的雪覆盖图像来自http://earthobservatory.nasa.gov，由NASA的Terra卫星上的中分辨率成像光谱辐射计（MODIS）数据衍生而来。两张地图表示2001年和2004年同一8天期间北美最大雪覆盖面积。
Recent global temperatures
近期全球温度
 Index

References
Collins, et al.
索引参考Collins等
 
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