Retinaldehyde
视黄醛
🗣️ 情景例句
Can you manage English conversation?
你能用英语谈话吗？
Took you long enough!
你现在才来！
Duck, and like them the pigeons, are endowed with such-like muscles, that are a good part of the weight of the bird,
野鸭及它们相似的鸽子有天赋的钢铁般的肌肉，占了体重的很大一部分。