When you have come to this really deeppoint that this book has no end and no beginning, which means you are that book.
当你已经到达了这个真正的深度那么这本书就没有结尾也没有开始，这意味着你就是那本书。
2
He pondered, as if over some deep philosophical point.
他沉思着，仿佛在思索某个深奥的哲学问题。
《牛津词典》
3
It is important to point out that students also need to have a deep understanding of their own culture before they can begin to observe, analyze and evaluate other cultures.