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单词 main belt
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main belt
main belt n. Astronomy the region of the solar system in which the majority of asteroids have their orbit, located between the orbits of Mars and Jupiter.
ΚΠ
1962 F. I. Ordway et al. Basic Astronautics iii. 81 The large asteroids are all found within the ‘main belt’ which extends from approximately 2 to 4 astronomical units from the Sun.
1987 P. Moore Astron. Encycl. 41/2 Jupiter is largely responsible for the distribution of the bulk of the asteroids into a so-called main belt between 2.15 and 3.3 AU.
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