know sth. backwards and forwards 洞悉某事物
After 30 years in the business, she knows it backwards and forwards.
Be rusty 某种技能由于缺乏使用而变得不够熟练
Be proficient in sth. 掌握得非常纯熟
Be out of sb.'s depth 超出了某人的能力范围
testing ground 试验场
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know sth. backwards and forwards 洞悉某事物
After 30 years in the business, she knows it backwards and forwards.
Be rusty 某种技能由于缺乏使用而变得不够熟练
Be proficient in sth. 掌握得非常纯熟
Be out of sb.'s depth 超出了某人的能力范围
testing ground 试验场