“费力地”的英语可以翻译为：arduously，painfully ...

查利费力地将背包背到楼上自己的公寓里。Charlie humped his rucksack up the stairs to his flat.他涨红了脸，费力地喘着气。He was going red in the face and breathing with difficulty.他费力地拄着拐杖，一瘸一拐地着向汽车走去。Using his stick heavily, he moved jerkily towards the ...