once the hydrogen in the Sun’s core is exhausted, it will expand into a red giant, and eventually eject its outer envelope of gases to become a white dwarf. 请教一下元叔~~这里的it为什么指代错误呢?it要是指代hydrogen不是翻译不通只有指代sun吗?。。不是说 代词指代错误有歧义 是在语法 逻辑都讲得通的时候吗。。~~~ 谢谢啦!!~~