Ooporphyrin
蛋壳色素, 蛋壳卟啉
🗣️ 情景例句
We will also need a letter of recommendation.
我们还要求一封推荐函。
Jeff was not pleased with his school grades.
杰夫不满意自己在学校的成绩。
I've recently noticed that one of my work-mates is stealing.
我最近注意到，我的一个工友在行窃。