-(同一个时间)atthesametime;simultaneously;concurrently;inthemeantime;meanwhile;intheinterim;perinterim:
existsimultaneously;existsidebyside;同时存在
happenedatthesametime;coincide;concur;synchronism同时发生
-(并且)moreover;besides;furthermore:
Thetaskisarduous;besides,there'snotmuchtime.任务艰巨,同时时间又很紧迫。