// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
The report said the longer a patient was off sick, the less likely they were to return to work. If someone was absent for 4-6 weeks, there was a 96% chance of them going back. But that dropped to 50% after a year, the report added.，这一点在whatsapp中也有详细论述
，更多细节参见谷歌
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