Definition: If a drink is flat, it does not contain enough bubbles of gas. Level: C2
这杯柠檬水没气了。
This lemonade is ___flat.
这瓶香槟开了好几个小时，气泡已经完全跑光了。
The champagne had been open for hours and was completely ___flat.
我把苏打水放在外面过夜，现在它已经变平淡了。
I left the sparkling water out overnight, and now it's ___flat.
