求翻译：据媒体20日报道，国家安监总局有关人士表示，“7.23”温州动车追尾事故的调查仍在进行当中，何时对外公布调查报告“没有既定时间表”。是什么意思？

20, according to media reports, the State Administration of Work Safety, said the person, "7.23" Wenzhou motor car rear-end accident investigation is ongoing, when the report announced, "there is no set timetable."

According to media reported on March 20, the State Administration of Work Safety Supervision official said, "7.23 " Wenzhou car crash investigation is still in progress and when it will release its report, "There is no established timetable".

According to the media on 20th reported that, the National Peaceful Jail Bureau people concerned indicated, “7.23” Wenzhou moved the vehicle to follow the accident the investigation still in the middle of march, hasn't the foreign announcement report of investigation “decided when the timetable”.

According to media reports on 20th, State administration of safety supervision relating to the situation said, "7.23" Wenzhou motor car rear accident investigations are in progress, when the published report "there is no established timetable".

According to media reports on 20th, State administration of safety supervision relating to the situation said, "7.23" Wenzhou motor car rear accident investigations are in progress, when the published report "there is no established timetable".