不敢当: I dare not (accept the honor); I don't deserve your praise, you flatter me...
性质: nature, characteristic...
商人: merchant, businessman...
圆满: satisfactory, consummate, perfect...
闭: to close, to stop up, to shut, to obstruct...
比如说: for example...
谈起: to mention, to speak of, to talk about...
酸奶: yogurt...
大爷: (coll.) father's older brother, uncle, term of respect for older man...
寂寞: lonely, lonesome, (of a place) quiet, silent...
