encourage:To inspire with hope,courage,or confidence; hearten.
鼓励,鼓舞：以希望、勇气或信心等鼓舞；使振作
stimulate:To rouse to activity or heightened action,as by spurring or goading; excite.See Synonyms at provoke
激发：激发活动或更兴奋的活动,如通过刺激或激励；使兴奋参见 provoke