He always thought that he had chosen a wrong course, so he played games every day and didn't study at all.
他总是认为他选错了课程,所以他每天都玩游戏,根本不学习。
A climber on the mountain knows immediately if his foothold is secure; a pianist knows instantly when she's played the wrong note.
在山上的登山者立即知道他的落脚点是否安全;一个钢琴演奏者即刻知道她何时弹错了音符。
他演奏的曲调全错了。
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