认识你的「画布」：BeatBox在你开始创作之前，我们想先向你介绍一下这次你要使用的画布，BeatBox。
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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%.，这一点在夫子中也有详细论述
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