Anthrafilt
过泸用无烟煤
🗣️ 情景例句
Please excuse me for a minute.
失陪一会儿。
What did you ask him?
你问他什么？
When you have finished your experiment, please tidy the lab and put everything back in the cupboards.
做完实验后，请你们把实验室整理好，并把所有的东西放回器皿柜。