Leapfrogging
[电] 跳背法
🗣️ 情景例句
She was playing with the idea of studying abroad.
她有出国留学的念头，但并非很认真。
I wrote several letters on my mother's behalf.
我代表我母亲写了几封信。
Do you know the story of the woodcutter?
你知道那个伐木工人的故事吗？