an area of something, typically land or sea, presenting a wide continuous surface
广阔的地域(或海域等);广阔,浩瀚
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the green expanse of the forest .绿色的林海。
the distance to which something expands or can be expanded
扩张距离;膨胀量
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the moth has a wing expanse of 20 to 24 mm .那只蛾的翅展达20至24毫米。
"mid 17th cent.: from modern Latin