Biuniqueness
双向单一性
🗣️ 情景例句
Mr. Douglas is currently on leave.
道格拉斯先生眼下正在休假。
The room is always a mess after the children have been playing in here.
儿童玩过之后的房间，通常都是乱糟糟的。
The young man did not wake up until the bed had struck the ground.
那年轻人直到床撞到地上才醒了过来。