Ooporphyrin
蛋壳色素, 蛋壳卟啉
🗣️ 情景例句
It's the biggest company in the country.
它是全国最大的。
Do you usually do arithmetic on Sunday?
你通常在星期日做算术吗？
The people performing all play different instruments and three of them sing too.
参加演出的人都要演奏不同的乐器，其中三位也演唱。