“在校门口”用英语说是At the school gate.
school gate：校门口
“在校门口”用at the school gate表示，at是介词，意为“在（加小地点）”，the是定冠词，表示特指，school gate意为“校门口”，故为at the school gate。
相关例句：
1、She told me that they were to meet at the school gate.
她告诉我他们约定在校门口见面。
2、Let's meet at our school gate at 4 o'clock.
我们四点钟在校门口见面吧。
3、Remember to wait for me at the school gate tomorrow morning.
别忘了明天早晨在校门口等我。
