可替换性Portability
Portability
解决什么问题What problem it solves
换个模型或服务商，需要改多少东西。How much has to change if you swap models or providers.
这是什么What it is
方案对特定供应商的依赖程度，通用协议与开放格式能显著提高可替换性。
How dependent a design is on a particular provider. Open protocols and formats raise substitutability substantially.
为什么需要知道Why it matters
这是长期成本里最容易被忽略的一项，也是抗中断能力的基础。The most easily overlooked item in long-term cost, and the basis of resilience when something breaks.