Tacinvariant
互[相]切不變式
??? 情景例句
Sorry, I'm afraid I'm busy tonight.
對不起， 今晚我恐怕沒空。
I have been told you have just changed the interest rate on savings accounts. Is that true?
聽說你們儲蓄率剛調(diào)過，是真的嗎？
I see.
我明白了。