Indocarbon
靛炭(一种硫化染料)
🗣️ 情景例句
I want to send this letter to China, by air mail.
我想把这封信航空邮到中国。
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。
(laughing) Really? I've never heard of that before! Thank you very much! Goodbye!
真的吗？我以往从来没有听说过这种事。非常感谢您！再见！