Here's the answer:
“水就行”
(shuǐ jiù xíng)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 91.25% of the time!
(shuǐ jiù xíng)
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 91.25% of the time!