书是一扇门，你打开它，然后走进去。
"A book is a door. You open it. You step through."
Silence is very important in music.
如果道歉夹带了借口，那就算不上是道歉。如果称赞夹带了要求，那就算不上是称赞。
债券市场是未来经济活动的最终预测者。