全球供应链面临支离破碎的危险，那些生产网络遍布世界各地的公司将为此付出沉痛代价。
Global supply chains are at risk of fragmenting, at huge cost to companies whose production networks are spread all over the world.
食物链是客观规律，一个生命的延续必然以其它生命为代价，老虎咬兔子，天经地义。
Food chain is a natural law. One living thing must feed on one another to live; thence it is natural that a tiger kills a rabbit.
不同的接口和网桥可能有不同的速度，当选择链路时这个值将用做参考。快速的接口应该具有较小的代价。
Each interface in a bridge could have a different speed and this value is used when deciding which link to use. Faster interfaces should have lower costs.
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