Backweld
背焊缝
🗣️ 情景例句
but I think we should face the truth.
但我认为我们应面对现实。
I'm a graduate of Yale University, I have an M.S.degree.
我是耶鲁大学的毕业生，我有理学硕士学位。
She heard the front door open and heavy footsteps in the hall.
她听见前门被打开，走廊里响起重重的脚步声。