It's conceivable that how excited for me to hear the news.
可想而知听到这个消息我有多兴奋。
It's conceivable that how hard their life is.
可想而知他们的生活有多艰难。
It's conceivable that friendship plays an important role in our life.
可想而知，友谊在我们生活中扮演着多重要的角色。