This one is a little longer: " com-ftra, ftra, bull" , " comfortable" .
这个有点长：“com-ftra, ftra, bull”，“comfort”。
英语百科
Freight Train Riders of America
（重定向自FTRA）
The Freight Train Riders of America (FTRA) is an American gang of homeless people who move about in railroad cars, particularly in the northwestern United States and are linked to many violent crimes.