Steganogram
密码
🗣️ 情景例句
And a good paint job.
还需要好好的粉刷。
Have you washed anything?
你洗东西吗？
where chance discoveries play a much larger part than they do in physical and mechancal industries.
同物理和机械工业相比，化学工业中偶然发现的机会要多得多。