礼尚往来: proper behavior is based on reciprocity (idiom), to return politeness for politeness...
创立: to establish, to set up, to found...
票: bank note, ticket...
不好意思: to feel embarrassed, to find it embarrassing, to be sorry (for inconveniencing sb)...
讲学: to lecture (on branch of learning)...
踏实: firmly-based, steady, steadfast, to have peace of mind, free from anxiety, Taiwan pr....
