Foldback
返送（系统）, 监听（系统）
🗣️ 情景例句
She is giving me piano lessons in exchange for her English classes.
我教她英语，她教我弹钢琴。
Is that all he thinks about?
他想的事只是这些吗？
The rumor had no basis.
那谣言没有·根据。