努力(做)...

to do an examination do an experiment in in an attempt to make an effort an atomic effort make an attempt at to do find it in one's heart to do be bound in honour to do sth. to-do effort do an experiment on do an experiment upon make an effort to do in an attempt to do spare no effort to do do an injury to sb an aspiration to do sth to put in an appearance an atomic effort make an effort be at an utter loss what to do try in vain to do sth find it in one's heart to do