Rarifying
vt. 使成精细；使变稀薄\\nvi. 变稀薄；纯化
🗣️ 情景例句
When will this time draft fall due?
期票什么时候到期？
He took two weeks off in August.
他在八月份休假两星期。
He's already a little weak in Chinese.
他的中文已经有点儿弱了。