One in three fourth-graders couldn't find their state on a map of the U.S.
四年级学生中有三分之一在美国地图上找不到自己所在的州。
The winnings go up from there. For example,the player who finishes in fourth place will still take home more than three million dollars.
VOA: special.2010.07.26
what three quantum numbers tell us, versus what the fourth quantum number can fill in for us in terms of information.
三个量子数和,四个量子数告诉我们的信息。
She goes here, she's a fourth year. She's three years younger than me.
她在这儿读书,大四了。她比我小三岁。
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