water-cleaner的用法和樣例：
例句
- If you look at a water filter, you can usually detect small chunks of charcoal inside of them.
如果你看凈水器一眼，你通常會(huì )發(fā)現它們的內部通常會(huì )有一塊木炭。 - Hard water ismainly caused by calcium and magnesium, which can be removed with a watersoftener.
硬水主要是因為溶在水里的鈣和鎂，我們可以透過(guò)凈水器來(lái)除去化們。
