But Michael O'Donnell says the number of serious bird strike incidents has remained at or below two hundred each year.

VOA: special.2009.04.01

Each year it's dramatized by the cycle of the seasons, And at a certain time of the year it seems that The forces of darkness and chaos are prevailing but each spring, Once again, cosmic order and life return.

每年这冲突都由季节的轮回戏剧性地体现出来，仿佛是每年都有一个时期,弥散着黑暗和混乱的势力，可是每当春天来临，宇庙的秩序又恢复了。

耶鲁公开课 - 旧约导论课程节选

But he says only one or two students usually choose it each year, and no one did in the graduating class in May.

VOA: special.2009.07.23

But in Louisiana alone, the oil and gas industry produces seventy billion dollars each year.

VOA: special.2010.06.19

But it welcomes between one hundred thousand and four hundred thousand visitors each year.

VOA: special.2010.02.15

But people still buy hundreds of thousands of copies of them each year.

VOA: special.2010.06.06