stack2.pop(); // 弹出无效的候选值
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但这次情况更严峻，着急忙慌的老爸一个劲追赶牛群，导致受惊的牛群沿着梯田越跑越远，直奔地那头的沟壑。两头慌不择路的牛遭殃了，一头踩进了6米深的坑，一头滚下了超过30米的陡坡。
const shared = Stream.share(source, {