Prechlorination
预加氯
🗣️ 情景例句
There's so much for young people to see and do.
这里有很多可供年轻人看和做的事情。
This is a camera.
这是一台照相机。
'And how can you explain that?' she asked.
“那么你对那又作何解释呢？”她问。