Lakalion
羥離子
??? 情景例句
I have to remember to put them in the bag
我必須記得將它們放進袋子里
We must work out some plan to increase our sales.
我們必須制定一些計劃來提高銷售成績。
The examination put a lot of stress on him.
那次考試給了他很大的壓力。