Retinaldehyde
视黄醛
🗣️ 情景例句
Will it take long?
要很久吗？
How ofter did I tell you to sit straight?
我告诉你多少次要坐正?
One of the first things Annie did was to teach me how to play.
安妮首先要做的事情之一，就是教我如何耍。