Paac
[医][=polyallyl acetate]聚醋酸烯丙酯
🗣️ 情景例句
John proposed marriage to Helen.
绚翰向沦论求婚。
The waiter seems to be in a hurry to take our order.
侍者似乎匆匆忙忙拿我们的订单。
that a series of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom.
才在大西洋测得一个个海水深度，同时通过挖掘海底，取得了研究海底的首批样品。