Polythioester
[化] 聚硫酯
🗣️ 情景例句
I'm leaving for Beijing on a four-day tour.
我马上要去北京旅游4天。
Better deny at once than promise long.
轻诺必寡信。
I'm planning to do a special study of satellites next term.
我计划下学期就卫星的问题做些特别的研究。