The first time meet, can handclasp, have the old friend that meet again after a long separation only, ability can be embraced each other, flap the shoulder of the other side. 初次见面，只能握手，只有久别重逢的老朋友，才可以相互拥抱，拍打对方的肩膀。
Long separated for one year, return to the home of friend and mentor of Shenzhen, and new, old friend's friendship ties, incomparably glad! 阔别一年,重返深圳益友家园,与新,老朋友联谊,无比高兴!
She's an old friend(= I have known her a long time). 她是我的老朋友。
She's an old friend of mine(= I have known her for a long time). 她是我的一个老朋友。
After a long separation, they held a glad meeting. 阔别多年之后, 他们举行了一个令人愉快的聚会。