Backstepping
n. 逐步退焊法\\nv. 往后退（backstep的ing形式）
🗣️ 情景例句
He's an exceptionally fine young man and should be a good husband.
他是一个很好的年轻人将来也会是一位好丈夫的。
If you're not happy, say it!
不高兴就说啊！
Professor Ronald Bracewell, a leading American radio astronomer,argued in Nature that such a superior civilization, on a visit to our own solar system,
假如有如此高级文明生命访问了我们的太阳系，