朋友是江苏如皋人，她说小时候家里种的黑塌菜遍地都是，谁也没把它当回事。可如今，靠着冷链技术，这不起眼的“土菜”竟坐上飞机出了海，成了外国人餐桌上的稀罕物。还有哈尔滨，那片冰雪本是当地人习以为常的冬日，用好用足，叠加热情服务，乐了八方来客，连本地人也感慨“尔滨，你让我感到陌生”。绿水青山、冰天雪地都是金山银山，思想入心、思路出新，寻常风景也有新的价值坐标。
class HttpClient:
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merge(arr, left, mid, right); // 合并两部分
Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.
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