planetarium的复数形式怎么写？

The planetarium staff also prepared talks for radio broadcast.天文馆的工作人员还要准备讲稿给电台广播.On his days off, he takes them to the Museum of Natural History or the Planetarium.休假的日子里，他就带他们去自然历史博物馆或是天文馆。The motions of the stars can ...

planetarium的音标：planetarium的英式发音音标为：[ˌplænɪ'teəriəm]planetarium的美式发音音标为：[ˌplænɪ'teriəm]...

n.天文馆，天象仪...