Lutation
密封, 封闭
🗣️ 情景例句
Now for the hard part.
现在到了最难的部分。
Please tell him to stop running in and out.
请告诉他不要跑进跑出。
During the summer, I noticed tat the leaves of the tree were beginning to wither.
到了夏天，我发现树叶开始枯萎，