天文馆的工作人员还要准备讲稿给电台广播.The planetarium staff also prepared talks for radio broadcast.休假的日子里，他就带他们去自然历史博物馆或是天文馆。On his days off, he takes them to the Museum of Natural History or the Planetarium.葛饰区乡土天文馆是一所地方历史博物馆和天文馆.Katsus...
Except for the transitional elements, valency electrons are in the outermost electron shell.除去过渡元素外, 价电子位于最外面的电子层.Hung believes the electrolyzed water steals electrons from molecules that the bacteria need for survival.黄...