你是我心目中的唯一用英文怎么表达？

　　There's only one seat so you'll have to sit on my lap.

　　只有一个座位，你只好坐在我腿上了。

　　After only one game, the chess champion had the measure of his young opponent.

　　仅仅一局过后，国际象棋冠军就摸清了年轻对手的实力。

　　Only one carry-on is allowed.

　　随身只能携带一个小包。

　　This left me only one possible course of action

　　这样我只有一条路可走。

　　Only one third get financial help from their fathers

　　只有三分之一的人得到父亲的经济援助。