on board day

on board day on board,on the board on board什么词性? on the board of "clean shipped on board", on board the ship? 救命!on board on the board,on board, on a board ,ob board的区别大神们帮帮忙 on 还有on the board,on a notice board on the board和on board的区别, on board和on board的区别及用法, aboard 等于 on board吗