不幸的是，你必须随身携带必要的设备，因为几乎不可能找到天然的替代品。
Unfortunately, you must carry the necessary equipment with you, since it's all but impossible to find natural substitutes.
解决之道是，尽可能进行多元化经营，尽力把自己打造成不可替代的供应商，使客户永远不会弃你而去。
The answer is to diversify if you can, and try your best to be an irreplaceable supplier so that you can never be dumped.
“你知道你是不可替代的，”萨姆告诉我，昨晚我在波哥大。
"You know you're irreplaceable," Sam told me on my last night in Bogota.
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