I could bake a better cake with one arm tied behind my back! 我可以轻而易举地烘烤出一只更好的蛋糕。
I thought I could trust you to discuss our problems frankly, and not to go behind my back complaining to the manager. 我原为以你会担率地谈谈我们间的问题，不会背着我在经理面前说我坏话的。
He has the impudence to take things behind my back! 他背著我拿东西真不害臊！
