This fragmentation hurts portability. Code that performs well on one runtime may behave differently (or poorly) on another, even though it's using "standard" APIs. The complexity burden on runtime implementers is substantial, and the subtle behavioral differences create friction for developers trying to write cross-runtime code, particularly those maintaining frameworks that must be able to run efficiently across many runtime environments.
1970s was was increasingly invested in "midrange computers" or "midcomputers"
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与此同时，全国泊位数量约1.5万个，基础设施短板明显，“买得起、停不起、用不起”仍是现实约束。
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