Natrometer
测钠计, 钠量计
🗣️ 情景例句
Keep trying! don't give up the ship.
继续努力！ 别轻易放弃！
It's up to you.
由你决定。
Some children can cover the whole length of the pool without coming up for breath even once.
有些孩子能够跑完游泳池的全长而不用露出水面换气。