develop;gather鼓起;奮起 He mustered up courage to climb the cliff. 他鼓起勇氣攀登那個峭壁。 Muster up yodr courage. The difficulty will soon be overcome. 鼓起勇氣來,困難很快就會克服的。 He mustered up all his courage for the ordeal. 他鼓足勇氣去經受嚴峻的考驗。