Phthalanone
邻羟甲基苯甲酸内酯
🗣️ 情景例句
Well, I'm glad you're feeling better
我很高兴各位感觉好些。
No,I don't .
不，我没有。
The pictures it sent us were very disappointing because its main mirror was faulty!
它传送给我们的图像很令人失望，因为它的主要镜子有误差。