| 单词 | cassini division |
| 释义 | Cassini division in American English (kæˈsini) the gap or dark region between the two main outer rings of Saturn: it has a width of about 4,700 km (2,920 mi) : also Cassini's divisionCassini division in American Englishnoun Astronomy a 3000-mi. (4800-km) wide dark region that separates the middle and outermost rings of the planet Saturn Word origin [named after Italian astronomer Giovanni Domenico Cassini (1625–1712), who discovered it in 1675] |
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