Planet x
未知行星；冥外行星
🧩 词语组成解析
🗣️ 情景例句
Yes. It's the anniversary of one of our important revolutionary movements.
是的。它是中国一个重大革命运动的纪念日。
I've made a reservation at the hotel you used last time.
我已预订了你上次住过的旅馆。
He began his diet a week ago.
他是一星期前开始节食的。