发动机发出了一种新的声音, 仿佛一阵阵吃力的哮喘.A new noise came from the engines a straining, gasping sound.我离那头麋鹿非常近，能听见它吃力的呼吸声。I was close enough to the elk to hear its labored breathing.清除积雪是很吃力的工作.It's hard work shifting snow....

“吃力的”的英语可以翻译为：demanding，exacting，hard，operose，labored ...