夸: to boast, to exaggerate, to praise...
友人: friend...
高级: high level, high grade, advanced, high-ranking...
吧: modal particle；...
讲: to speak, to explain, to negotiate, to emphasise, to be particular about, as far as sth is concerned, speech, lecture...
情人: lover, sweetheart...
椭圆: oval, ellipse, elliptic...
直升机: helicopter...
交集: intersection (symbol ∩) (set theory)...
拉: to pull, to play (a bowed instrument), to drag, to draw, to chat, (coll.) to empty one's bowels...
