Echinenone
海胆酮, β-胡萝卜素-4-酮
🗣️ 情景例句
He started out as a salesman.
他开始时当推销员。
What do economists say about the present crisis?
经济学家们对于现在的危机做何说法？
In the evenings he studied hard for his exams, and most mornings he took tourists around Oxford.
他晚间努力学习，以应付考试，而大多数早上，他则带领游客在牛津大学参观。