按12年来算，每年少15天意味着美国小孩一共少上180天的课，等于1学年。
Over 12 years, a 15-day deficit means American children lose out on 180 days of school, equivalent to an entire year.
按12年来算，每年少15天意味着美国小孩一共少上180天的课，等于1学年。
Over 12 years, a 15-day deficit means American children lose out on 180 days of school, equivalent to an entire year.
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