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....
In semiconductor receivers transistors take the place of vacuum tubes.在半导体收音机中晶体管代替了真空管.We often turn to this handbook for information on transistors.我们常从这本手册查阅有关晶体管的资料.The transformer isolates the transistors with regar...