Backstopping
支援（backstop的现在分词）
🗣️ 情景例句
Your duties include checking the post and distributing it.
你的职责是检查和发送邮件。
Thank you.
谢谢您。
It's the library's. Please be more careful from now on!
“是图书馆的书。从现在起请你倍加小心！”