Hai
abbr. 国际保健行动（Health Action International）；自动调温式空气滤清器系统（Hot Air Intake）
🗣️ 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。
The more we study, the more we discover our ignorance.
学得越多，就越发觉自己无知。
Perhaps in those days I was. Pierre and I did have a very good time at the ball. But that was the last moment of happiness in our lives. That night everything changed.
那时候，我也许是个漂亮姑娘。我和比尔在舞会上的确玩得很痛快。不过，那是我们一生中最后的幸福时刻。那天晚上一切都变了。