(1) Now we can only stay at home so as not to be infected with the virus.(so as to... 以便,为的是 ......) (2) I think back to the previous Spring Festival. (think back 回想 ) (3) Try to go out less, in order to better prevent cross infection of the virus. (try to do... 试着去做 ......) (4) I believe that the people of the whole country will never give up and persist in fighting the disease. ( give up doing sth 放弃做某事; persist in doing sth 坚持做某事 )