有原因的: http://www.ibtimes.com/may-2013-us-auto-sales-forecast-sales-se Kelley Blue Book's Forecasts Worst May 2013 U.S. sales performance: Hyundai/Kia, down 3.2 percent to 115, 000 units. Best May 2013 U.S. sales performance: Nissan North America, Inc., up 19.8 percent to 110,000 units. Worst U.S. market share contraction: Toyota Motor Sales, U.S.A., Inc., down 1.1 percent to 14.1 percent. Best U.S. market share expansion: Nissan North America, Inc., up 0.9 percent points to 7.8 percent. Edmunds.com's Forecasts Worst May 2013 U.S. sales performance: Toyota Motor Sales, U.S.A., down 0.2 percent to 202,482 units. Best May 2013 U.S. sales performance: Nissan North America, Inc., up 19.6 percent to 109,789 units. Worst U.S. market share contraction: Toyota Motor Sales, U.S.A., Inc., down 1 percentage point to 14.2 percent. Best U.S. market share expansion: Nissan North America, Inc., up 0.8 percentage points to 7.7 percent.