| 单词 | planetarium |
| 释义 | Word Frequency planetarium(ˌplænɪˈtɛərɪəm) nounWord forms: plural -iums or -ia (-ɪə) 1. an instrument for simulating the apparent motions of the sun, moon, and planets against a background of stars by projecting images of these bodies onto the inside of a domed ceiling 2. a building in which such an instrument is housed 3. a model of the solar system, sometimes mechanized to show the relative motions of the planets |
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