Dfi
[医][=disease-free intervals]无病间期
🗣️ 情景例句
Don't open the door if you don't know who it is.
如果有陌生人敲门不要开门。
Can I fix an overseas call to London by person-to-person call?
我要打到伦敦的叫人电话好吗？
He sat in the darkness and listened to the people around him.
他坐在黑暗处，听着周围的人在讲话。