53. 一位有经验的教师曾经说，上课之前他觉得如临大敌，上课时他是如履薄冰，只有上完课后他才会如释重
负。

[误] An experienced teacher once said that before class he felt as if faced with a formidable enemy, in class he felt like walking on ice, and only after class would he feel relieved.

[正] An experienced teacher once said that before class he felt as if faced with a formidable enemy, in class he felt like walking on eggs, and only after class would he feel relieved.

注：中文的“如履薄冰”是比喻一个人“做事十分小心谨慎或战战兢兢”，而英语的类似说法却是
walk on eggs 或tread on eggs，要注意中英文喻体的不同。