英语语法分析

I'm not sure why she refused their inv IT ation.

我尚不能肯定她为什么拒绝他们的邀请。

I received an inv IT ation to the party yesterday, but I refused to accept IT.

昨天我接到一份参加晚会的邀请，但我拒绝了接受。

So they don't take inv space. but apparently you an only hold 10 you're not using.

他们不占据背囊空位，但你只能携带10个备选。