Perthiocarbonate
过硫碳酸盐
🗣️ 情景例句
I think you are getting off the subject. Could we get back to the main point, please?
我觉得你跑题了。 我们能不能回到主题上来？
John is not forty-five yet,is he?
约翰不够45岁,是吗？
The problem now facing humanity is: What is going to be done with all this knowledge?
用这些知识去做什么？