Backstops
n. 挡球网；捕手；支撑物
🗣️ 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 know the boy whose father is a missionary.
我知道那个男孩的父亲是传教士。
What did he do?
他是干什么的？