Backstepping
n. 逐步退焊法\\nv. 往后退（backstep的ing形式）
🗣️ 情景例句
They live from hand to mouth.
他们过着糊口的生活。
I can't express how happy I am that you have come.
我无法说出来了我是多么高兴。
The nurse assisted the doctor in the operating room.
护士在手术室协助医生动手术。