well trained

خوب تربیت شده.
Well trained children
بچه های با تربیت

ماهر - خبره - آموزش دیده
I mean, if people refuel airplanes while flying how hard could it actually be to do it to a truck while driving ?
Can't compare directly.
Airplane refueling hoses are much longer : ) and they are well trained.

زبده و از نظر استاندارد های اموزشی بالا بودن و ماهر بودن
well - trained teacher ( معلم زبده و کاربلد )

ورزیده

ماهر