What observations could tell whether the expansion of the universe is driven by dark energy or whether we are living in a special place, such as at the center of a giant void?

• 有关膨胀的宇宙是否被暗能量所驱动的和我们是否处在一个特殊位置(例如巨大空洞的中心位置)的问题，观测到底能告诉我们什么呢？