await checkEndpoint(url);
即便愿意付正价的客人，看到身边人都在买折扣券，也会跟风选择，这就让门店陷入了“想服务正价客人、想保持合理利润却不可得”的困境。
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Earlier we saw that Option can sometimes store None for free by using a niche value (for example, a null pointer). ArchivedString no longer has such a niche. All byte patterns are now valid, because the inline representation uses the entire buffer.
从实验室到产业化应用并不容易。王鹤说：“企业要想迅速响应市场需求，需要强化企业创新主体地位，让创新链和产业链无缝对接。”