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.
圖像來源，Getty Images，推荐阅读safew官方下载获取更多信息
Lovell, who was also part of the Apollo 8 mission, was the first man to go to the Moon twice - but never actually landed.。关于这个话题，爱思助手下载最新版本提供了深入分析
// 易错点6：返回整个数组（如this.res）→ 不符合题目要求，题目要求返回单个数值
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