So how do you know when shoes need to be retired? Don't use the treads of your running shoes to determine whether you should replace your shoes.
那么你怎样才能知道什么时候让你的跑鞋退休呢?不要用鞋跟来决定是否应该换鞋子了。
It is whether it can keep coming up with the new products and services it needs to sell to pay for the food and the shoes it no longer produces.
而在于它是否能继续生产新产品和提供新服务,以弥补因不再自产的鞋子和食品造成的损失。
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