In this case, having to then let go of the book after holding it might generate a subtle sense of loss, and motivate us to make the purchase even more.
在这种情况下，拿着书后不得不放手，可能会产生一种微妙的失落感，并促使我们购买更多。
2
In any case, book a seat within seven rows of an exit.
无论如何预定一个在出口附近几排的位置。
3
The class of the object that will be updated atomically (in this case, Book).