aboard: 在船(或飞机，车)上。如：I never went aboard a ship.
broad: 为形容词，宽广的。如：He has very broad shoulders.
abroad: 副词，在国外或海外。如：He often goes abroad.
board: 为动词，上(船，飞机，车)。如：The passengers are boarding the plane now.
enhance: 使…看起来更好；提高；美化
cement: （比喻）将…结合在一起；加强；巩固。如cement a friendship表示“加强友谊”
strengthen: 使…更强