重点讲解：
1. be dependent on 依靠的；依赖的；
You can't be dependent on your parents all your life.
你不可能一辈子靠父母生活pOZ&@I-%N0vHl2Uq3。
2. trade sth. for sth. 用…进行交换；互相交换；
They traded land for goods and money.
他们用土地换取了货物与金钱L2o_YdVth4~FZ70。
3. in return 作为回报；作为交换；
It seems only fair that they should give us something in return.
似乎他们应该给我们点什么作为回报才像话__3&WQ=9dg0(Hbu。
4. go around 都能分到；够每人一份；
Eventually we will not have enough water to go around.
最终，我们将没有足够的水供大家喝dT2]&Wl5Z2J。