The problem for companies is working out which of these products will become a hit and which will gather dust on a shelf.
厂家的真正难题是判断：哪些产品将火爆，哪些产品将积压。
Just at that time, I was hit by a large fish can falled off from the top of the shelf.
就在那个时候，我遭到大量鱼可以只是从上方的架子上。
The book fell from the shelf and hit him on the head.
书从书架上掉下来砸着他的头。
The book fell from the shelf and hit him on the head.
书从书架上掉下来砸着他的头。
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