一项对九年级学生的研究发现,在九年级学生中,50%的友谊每个月都会发生变化,这表明友谊极其不稳定。
One study of ninth-grade students found that 50 percent of friendships among ninth graders changed from one month to the next, signaling striking instability in friendships.
在2007年夏天,平均每个月有22吨的炮火砸在赫尔曼德。
During the summer of 2007 an average of 22 tonnes of ordnance was dropped on Helmand every month.
在1996到2004年间,每个月平均产生550000件生意。
Between 1996 and 2004 an average of 550, 000 small businesses were created every month.
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