Sif
abbr. selective identification feature 选择识别特征
🗣️ 情景例句
Merry Christmas, Carl and David!
卡尔，大卫，圣诞快乐！
I doubt it.
我表示怀疑。
We can't go to the public parks or swimming pools.
我们不能上公园或是去游泳池。