Sef
abbr. 海峡交流基金会（Straits Exchange Foundation）；严重误码帧（ Severely Errored Frame）；钠排泄因子（sodium excreting factor ）
🗣️ 情景例句
You've got it all wrong.
你完全搞错了。
You look tired. Have you been getting enough sleep?
你似乎累了。睡眠充足吗？
He opened it and saw the man from downstairs.
他打开门，看见楼下人。