定存什么：要下标/距离就栈里存索引，只要值就存值或存索引再 nums[i] 取。
而且，实况照片还能在后期选择更进阶的玩法——「长曝光」。如果你在手持拍摄烟花或车流，打开长曝光，原本凝固的光点会瞬间变成流动的光轨，那种动静结合的美感，是普通照片给不了的。
，这一点在旺商聊官方下载中也有详细论述
In practice, this means:
“Given rising tensions in the region, Chiefs of Mission and embassies at addressee posts must refrain from public statements, interviews, or social media activity that could in any way inflame regional audiences, prejudice sensitive political issues, or complicate US relationships,” the cable said.