Retinaldehyde
视黄醛
🗣️ 情景例句
How much money are you presently earning?
你目前挣多少钱？
Health is not valued till sickness comes.
有病方知无病乐。
He lands on top of each house and climbs down the chimney into the fireplace.
他降落在每一家的房顶，顺着烟囱爬进壁炉。