贫困国家的儿童平均每年患四次腹泻病，每次都可能丧生。
Children in poor countries get diarrhoea on average four times per year. Each of these episodes can be life-threatening.
过去，美国家庭在家设宴招待客人的频率每年仅有四次左右，但Mirabile预计，这个数字肯定会上升。
In the past, American households entertained at home some four times a year, a number that is sure to rise, he predicted.
从4月27日起，美联储会效仿其他国家央行的做法，也许会在每年八次年度会议的第四次之后召开新闻发布会。
From April 27th the Fed will copy the practice of other central Banks and hold press conferences. They will take place after four of its eight annual meetings.
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