Backstopping
支援（backstop的现在分词）
🗣️ 情景例句
Thank you, Mr. Wang. See you later.
谢谢您，王先生。再见！
The industrial area is centered largely in the north.
大部分工业区域集中在北方。
And don't set the hillside on fire either!
“也不要把山坡弄着火了。”