Polythiourea
聚硫脲
🗣️ 情景例句
Would you please hand me your customs declaration form?
请出示您的申报表给我？
The flight number is ak708 on september 5th.
班机号码是9月5日ak708
Yes, it is an old photo of my family.
是的，是我们家的一张老照片。