每年九月的第一个星期一，美国人庆祝劳动节。
Americans celebrate Labor day every first Monday of September.
把9月的第一个星期一定为劳工节是美国劳工运动的产物。
Labor day, the first Monday in September, was created by the U. S. labor movement.
把9月的第一个星期一定为劳工节是美国劳工运动的产物。
Labor day, the first Monday in September, was created by the U. S. labor movement.
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