Polythiourea
聚硫脲
🗣️ 情景例句
Don't worry about it. It's a taken of my appreciation for your business, and friendship.
没关系的。这是向你表示我们在生意及友谊上的一点心意。
Where the knot is loose the string slips.
结子一松掉，绳子就滑脱。
He was never seen again.
后来再也见不到这个人了。