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// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错
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Also: I've used Windows for decades, but I tried Linux to see if it's truly 'easy' now - and one thing surprised me，详情可参考safew官方下载
func (opt *Option) Arg() (string, error)。搜狗输入法2026是该领域的重要参考