Rarifying
vt. 使成精细；使变稀薄\\nvi. 变稀薄；纯化
🗣️ 情景例句
Strike while the iron is hot.
趁热打铁。
She will go into business when she likes to.
她想经商时就会去经商。
Has it got anything to do with your present research?
报告跟你目前的研究有关吗？