Rarefying
v. 使稀薄( rarefy的现在分词 ); （思想等）精炼; 使纯化; 使变得精妙深奥
✅ 同义词
🗣️ 情景例句
Yes, this is my youngest son Robbie.
是的 这是我的小儿子Robbie。
Nothing is difficult to the man who will try.
世上无难事，只要人肯试。
In this way, he has begun his own private 'telephone' service.
就这样，他开始自己的私人“电话”业务。