当生产一定数量的产品后，机器不得不被更新。
After a certain amount of parts, the machine has to be replaced.
期货合约是在未来某个时间、以某个价格买卖一定数量的产品。
A futures contract is an agreement to buy or sell a quantity of a product at a set price and date in the future.
在生产了一定数量的产品后，它们不得不重新拆卸后，进行再一次的抛光处理。
After a certain number of production cycles, they have to be taken down and sent for re-polishing.
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