Galumin
氧化鋁鈣
??? 情景例句
Littering is a serious offense in some countries.
亂扔垃圾在某些國家是嚴重的違法。
Mountains look beautiful from a distance.
遠處看山山更美。
What will be the population of the world in the year 2000?
2000年世界人口將是多少？