• 轮流,交替

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1. The company is prepared to trade off its up-market image against a stronger appeal to teenage buyers.
   该公司拟改变只售高档商品的形像，以吸引青少年顾客。
2. I'd like to see what chance I could find to trade off my ax handles.
   我要看看我能找个什么机会卖掉我这些斧头柄。