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FOR For主要跟在下面这些名词的后面： * a check for (amount of money) 例句: She gave me a check for $50. 她给了我一张50块钱的支票。 * a demand for something 例句: Unfortunately, there wasnt enough demand for our product. 不幸的是，我们的产品市场需求不大。 * a need for something 例句: There is a real need for discipline in this class. 这个班级，没纪律不行。 * a reason for something 例句: I have a reason for doing that! 我这么做是有理由的。 IN In主要在下面这些名词后面： * a rise in something 例句: There has been a rise in prices recently. 最近价格上涨了。 * an increase in something 例句: We have seen many increases in production levels. 我们看到生产水平有了很大提高。 * a fall in something 例句: There has been a fall in prices recently. 最近价格有了下降。 * a decrease in something 例句: We have seen many decreases in production levels. | 
