Backstepping
n. 逐步退焊法\\nv. 往后退（backstep的ing形式）
🗣️ 情景例句
I want to make a deposit.
我想存钱。
Are you Peter Smith?
你是彼得·史密斯吗？
To my surprise, he gave me the money immediately.
令我惊奇的是，他立刻把钱给了我。