Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.
这一天下来，家里人都吓得不轻，老爸缓不过神来，他没胃口吃东西，腿也瘫软了。正巧这天是“人日”，相传是人类的诞辰日。按老家习俗，家家户户要为人丁叫魂，不管魂丢没丢，都得叫魂。
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