await writer.end();
从这个意义上看，转型并不是一次简单的商业模式切换，而是一场关于平台角色的重塑。
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// ⚠️ 易错点3：此处返回n而非0（完全有序无需排序，长度为0）
Compact cameras tend to have smaller sensors and slightly lower quality lenses, but they’re obviously easier to carry — most will fit in a large pocket. So, if budget, convenience and portability is the most important to you, then go for a model in this category.，更多细节参见同城约会