Diffusant
扩散剂
🗣️ 情景例句
Excuse me, Mr. Carlson,
对不起 ，Carlson先生，
What is this?
这是什么？
suggested an idea on which he had been working for many years to the British Government and industrial circles.
他向英国政府和工业界提出了他研究多年的一项计划。