bất ngờ 
accidental like: zufällig → →
zufällig ☊ 
tình cờ, ngẫu nhiên ☊ 
☊ zufällig ☊ 偶然间 ☊ ǒu rán jiān We met by accident at the airport. ☊ by accident ☊
I didn't think our meeting was accidental—he must have known I would be there. ☊ accidental ☊
As I turned around, I accidentally hit him in the face. ☊ accidentally ☊
The damage couldn't have been caused accidentally. ☊ accidentally ☊
Several years after they'd split up they met again by chance in Paris. ☊ after ☊
They met by chance. ☊ by ☊
I met her by chance (= without planning to) at the airport. ☊ chance ☊
a chance encounter ☊ encounter ☊
It was a chance meeting that would change my life. ☊ meeting ☊
They met by pure chance. ☊ pure ☊
I saw the letter purely by chance. ☊ purely ☊
select sb/sth: a randomly selected sample of 23 schools ☊ select ☊