这里用的是 平行光，模拟太阳光。
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.。业内人士推荐快连下载-Letsvpn下载作为进阶阅读
for (let i = 2 * len - 1; i = 0; i--) {，详情可参考快连下载安装
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Фото: Fabrizio Bensch / Reuters