A spiral galaxy is shaped like a disk with a bulge in the center.The disk resembles a pinwheel, with bright spiral arms that coil out from the central bulge.是什么意思_A spiral galaxy is shaped like a disk with a bulge in the center.The disk resembles a pinwheel, with bright spiral arms that coil out from the central bulge.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句