Quartan
a. 每第四天复发的\\nn. 三日症
🗣️ 情景例句
My wife died four years ago.
我妻子四年前去世了。
You'll be on air in two minutes.
两分钟以后你会上电视。
It was upon this principle that the first instruments were made,
据这一原理，制造出了最初的地震仪器，