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，这一点在新收录的资料中也有详细论述
注意：这里用 Thread.sleep 模拟延迟，实际项目里换成真正的 Redis 查询、数据库查询和 HTTP 调用即可。
Twenty-five others were injured in the pre-dawn crash in the Himalayan foothills on Monday. The bus was carrying 44 people, including a number of tourists.