His suitcase is empty There is a lot of room in it,

问题描述:

His suitcase is empty There is a lot of room in it,
His suitcase is empty There is a lot of room in it,
in it又当什么讲

意思:他的行李箱很没装什么东西,里面还有很大的空间(可以放东西).
in it 是指在行李箱内.