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
Sure. Where are you going?
当然。您要去哪里？
While the grass grows the horse (or steed) starves.
远水救不了近火。
It wasn't easy to win the match. No. 64 Middle School is really a strong team.
赢这场球不容易。第64中学的的确是一支强队。