Immigration boosts innovation and wages in the US. The positive dynamic impact of immigration on innovation and wages dominates the short-run negative impact of increased labor supply. Increased immigration to the US since 1965 is estimated to have increased innovation and wages by 5%.

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Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-4, placed vertically.

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（2）虚拟线程开始执行 getCache()，执行到 Thread.sleep(50) 时，JVM 检测到这个操作会阻塞，于是：

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