Polythioester
[化] 聚硫酯
🗣️ 情景例句
we'll send you a letter of appointment and can sign a full distributor contract.
我们将给你们送上一份聘书，并签订一份总的销售合同。
Friendship cannot stand always on one side.
来而不往非礼也。
Don't throw it like that.Throw it like this.
不要那样扔，要这样。