Backstepping
n. 逐步退焊法\\nv. 往后退（backstep的ing形式）
🗣️ 情景例句
We're working on a solution right now.
我们眼下正在筹划解决方法。
Will you stay there for long?
你会在那儿待很长时间吗？
We had a very nice time.
我们过得非常愉快。