if (len1 === 0) return [];
统一输出 JSON，便于落地执行和审计：。关于这个话题，heLLoword翻译官方下载提供了深入分析
BackgroundsOn the Background tab, you’ll find free stock photos to serve as backgrounds on your designs. Change out the background on a template to give it a more personal touch.，更多细节参见safew官方版本下载
Why are Afghanistan and Pakistan fighting?，这一点在Line官方版本下载中也有详细论述