simple arbitration of exchange

例句：

1. 1. The simple design ofthe house is very appealing.
   房子的简单设计非常吸引人。
2. 2. The task was too simplefor him to be successful.
   这个任务对他来说太简单了，无法成功。
3. 3. The newsoftware is designed to be simple and easyto use.
   这款新软件旨在简单易用。