Tannigen
乙酰鞣酸
🗣️ 情景例句
He gave them to me to hold on to them
他给我戒指， 要我自己保管，
Jeff was not pleased with his school grades.
杰夫不满意自己在学校的成绩。
We can't let you have any more material.
我们不能再供给你原料了。