if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错
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Net international migration to the U.S. peaked at 2.7 million new entries in 2024, but has since sharply declined. It fell to 1.3 million last summer, according to January Census data, and then turned net negative, according to research from Brookings, meaning more people are leaving the U.S. than coming in. The private sector has weighed in, too, with Goldman Sachs economists reporting last week that immigration policies put in place over the past year have resulted in an 80% decline in net migration relative to the historical average.。业内人士推荐一键获取谷歌浏览器下载作为进阶阅读
一方面，.DS_Store 是跟随文件夹的，每个文件夹都会产生自己的 .DS_Store。