Erythronolactone
赤酮酸内酯
🗣️ 情景例句
He's been here for years, he should know the ins and outs of the job by now.
他在这里已经好多年，现在理应熟悉各方面的工作了。
Excuse me I couldn't help you.
对不起我不能帮助你。
How could we do that?
怎么说呢？