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.
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社交启蒙社交是她上幼儿园需要面对的一个重要问题，在家都是家人陪着玩，出门玩也是她自己玩的更多一些。3岁以前，都不太愿意跟别的小朋友接触，偶尔遇到大孩子喜欢她的，她也喜欢的会主动跟人玩。其他时候还是会躲着其他小朋友，如果她找别的小朋友玩，有时候她不敢，有时候别的小朋友不愿意跟她玩，她会失落。
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