老师

teacher; sir; instructor; tutor; mentor; educator; master

友好

friendly; amicable; cordial; matey; congenial; neighborly; companionable; kind; nice; warm; pleasant; welcoming; outgoing; sociable; good-natured; warm-hearted; friendship; amity; goodwill; warmth; kindness; nicely; kindly; warmly; OK; famously; disarm; make friends