Phosphatidalcholine
缩醛磷脂酰胆碱
🗣️ 情景例句
He knows all there is to know,
他无所不知，
If I went with you,I'd have to be back by six o'clock
如果我与你一起去了，我将不得不在6点钟回来。
OK. Let me help you. There! OK?
我来帮你，瞧，行了吧？