五代十国诸政权之中，吴越国祚最长，不仅因为钱氏三代五王的励精图治，也因为很多历史的偶然。
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Then someone on the team raises an eyebrow. “Isn’t that an extra function call? Indirection has a cost.” Another member quickly nods.，推荐阅读谷歌获取更多信息
we don't know the size of T, can't call any methods on it, can't compare it to anything. All we can do is return it—which is why the identity，这一点在游戏中心中也有详细论述