An estimated 4,400 children are injured on roller coasters and carnival rides every year, according to a recent study that includes 20 years worth of data.
estimate v.估计，估算；判断，评价 = approximately = almost = around
injured adj.受伤的，有伤的；委屈的，受到伤害的
roller coasters 过山车
carnival rides 大摆锤，嘉年华游乐设施
worth n.价格，价值
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