Dtf
资料传输因数（data transmission factor）
🗣️ 情景例句
When god closes a door, he opens a window.
山不转水转。
Your right hand is swollen.Does it hurt?
你的右手是肿的.它受伤了吗？
The secretary told me that Mr.Harmsworth would see me.
秘书告诉我说哈姆斯沃斯先生要见我。