усердно работать I see the men are still hard at work - when do you think the digging will be finished? I like the classroom best when all the children are hard at work on ideas that they have chosen themselves.
BE HARD AT WORK
Англо-русский перевод BE HARD AT WORK
Мюллер. English-Russian Muller's dictionary bed edition. Англо-Русский словарь Мюллера редакция bed. 2012