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红色线条表示迁出的主要方向，黑色线条则表示迁入方向。
Red lines represent moves out of the city and black lines show the opposite.
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图中，黄色和红色的线条表示警戒阈值。
The yellow and red line on the chart above represents the alert thresholds.
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图中，黄色和红色的线条表示警戒阈值。
The yellow and red line on the chart above represents the alert thresholds.
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