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
English-Russian Muller's dictionary 24 edition. Англо-Русский словарь Мюллера 24 редакция. 2012