tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）
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Magda Szubanski was inducted into the Logies Hall of Fame last year
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小麦是人类获取能量的主要来源。我国小麦常年种植面积3.5亿亩，总产量连续11年在1.3亿吨以上，占全球17%，是全球小麦生产与消费的第一大国。