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。

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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。

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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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As with 401(k)s, lower-cost, off-the-shelf defined-benefit plans have started to hit the market.

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Though the stand-up business has taken a hit in a weak economy, top-shelf comedians are still laughing all the way to the bank.

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Shelf-loads of business-advice books claim to have hit upon the secret, while would-be innovation gurus dine out on speaking fees.

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