Valid state
[计] 有效状态
🧩 词语组成解析
🗣️ 情景例句
It's so good to have you home again ...
真高兴 ，你又回家了……
We'll leave some evenings free,that is,if it is all right with you.
如果你们愿意的话，我们想留几个晚上供你们自由支配。
Don't look out of the window concentrate on your work.
别看窗外，专心工作。