这不仅缓解了医院对联邦老年医疗保险（Medicare）的依赖（Medicare报销率低，运营压力大），还避免了医院陷入债务危机——比如2008年被收购前，医院曾有2亿美元债务，正是基金会的支持，才让它得以平稳过渡。
Netflix Standard (with ads)，这一点在safew官方版本下载中也有详细论述
。关于这个话题，Line官方版本下载提供了深入分析
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.，这一点在WPS官方版本下载中也有详细论述
def __str__(self):