一旦
yídàn
in case (something happens); once (sth. has happened ... then); in one day
HSK 5
Part of speech: adverb
Homophones:
CONJUNCTIONS
Example Sentence
一旦发生问题,怎么办?
Yīdàn fāshēng wèntí, zěnme bàn?
What should be done if anything happens?
Related Words: