This is a reasonable optimization to do. It is never incorrect; your
// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined）。业内人士推荐爱思助手下载最新版本作为进阶阅读
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"Those that fail to do this – or ignore legally binding requests from us – should expect to face fines," he added.
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