The urban homeless are often in desperate need of sustenance.
城市里无家可归的人极其需要食

持
。
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钟英语 
榜样 These goods are hot sellers because they are either necessary for sustenance we all need to eat, while other items like smartphones and laptops are required for social function, communication, and navigation to just name a few.
这些商品之所以热销,
因为它们要么
们所有人都需要
食物,要么则
如智能手机和笔记本电脑等其他产品,
社交功能、通信和导航所必需
。
研究