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一只宠物狗在她和妈妈的腿间转，给屋里带来生气。
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4급 ‘마스가 과장’, 단숨에 2급 국장 파격 직행…“李대통령 OK”
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.