Backweld
背焊缝
🗣️ 情景例句
Different kinds of activities, such as commenmorative meetings, planting trees,
举行各种各样的活动，例如召开纪念大会，植树造林，
You're overdoing it.
别那么夸张。
May I come in, please? I'm sorry I'm late.
我可以进来吗？对不起，我迟到了。