This is the 6215th most frequent Chinese word.
开水
Boiled water.
Here, '开水' refers to boiling water used for brewing tea.
请帮我用开水泡茶。
Please help me brew tea with boiling water.
In this sentence, '开水' emphasizes boiled water intended for consumption or preparation but now cooled.
开水已经凉了，不能用来泡面。
The boiled water has cooled down; it cannot be used to prepare instant noodles.
In this context, '开水' indicates the process of making boiling water.