Doorstepping
(doorstep 的现在分词) n. 门阶
🗣️ 情景例句
Many people believe that GM food is not good for your health.
许多人认为基因改良食品对健康有害。
At what time?
什么时间？
Open the window and air the room.
打开窗子，给房间通通风。