Sif
abbr. selective identification feature 选择识别特征
🗣️ 情景例句
Western countries have evry strict visa requirements.
在西方国家有严格的签证要求。
Nothing comes out of the sack but what was in it.
无风不起浪。
Good. Put it on the small table, please.
好，把箱子放在那个小桌子上吧！