国家交通安全管理局表示，这是两年内对丰田汽车违反类似规定的第四次罚款。
The National Traffic Safety Administration says this is the fourth fine against Toyota in the past two years for similar infractions.
2007年8月曾展开过正式的调查，在为数不多的几次调查中，美国国家交通安全管理局曾开始对丰田车的异常加速问题的报告进行了全面的调查。
The investigation opened formally in August 2007, one of the few times NHTSA commenced a full-fledged investigation into reports of Toyotas accelerating unexpectedly.
起初，美国国家公路交通安全管理局(NHTSA)和丰田认为，不合适的脚垫可能卡住加速器，使之无法打开。
At first the National Highway Traffic Safety Administration (NHTSA) and Toyota thought that a badly fitting floor mat could have jammed the accelerator open.
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