while (stack2.length && stack2.at(-1) <= cur) {
走进商场或手机卖场，除了华为、苹果和三星，小米、vivo、OPPO、荣耀等品牌几乎都没有进行大幅降价，只有个别机型能叠加小额的平台或店铺优惠。另外，“生肖限定款”手机也基本上销声匿迹了。
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近年来，国内外多项动物心理健康研究显示，约23%的家养犬存在抑郁或分离焦虑倾向，超30%的家养猫存在心理亚健康与抑郁相关表现；老年犬猫、流浪救助犬猫及曾经历创伤的宠物，出现心理问题的风险显著更高。分离，对它们来说并非小事。
If the subject line of the email is irrelevant to customers, they will ignore it multiple times. But, if it keeps repeating, they are intercepted and unsubscribed from your emails. So, send relevant emails for the benefit of the customer. Don't send emails that often only focus on sales, offers and discounts.