Euxanthon
优吨酮, 1, 7-二羟(基)夹氧杂蒽酮
🗣️ 情景例句
How much do stamps cost?
邮票多少钱？
Thanks for the advice,but this is something I have to figure out myself.
谢谢忠告，但是这必须由我自己解决。
It's a desk.
一张书桌。