4. 大多數人都熟悉這樣一個概念，物質是由叫做原子的極小粒子組成的。
Most people are familiar with the idea that matter consists of very small particles called atoms.
5. 一星期由七天組成。
A week consist of seven days.
6. 混合物由兩種或更多彼此不發生化學合成并能被分開的物質組成的合成物
A composition of two or more substances that are not chemically combined with each other and are capable of being separated.
7. 馬氏本，馬登斯體一種由鐵和高達百分之一的碳組成的溶液，是硬化碳工具鋼的主要成分。
A solid solution of iron and up to 1 percent of carbon, the chief constituent of hardened carbon tool steels.
8. 鑒于稅務原因，我們得組成公司。
We had to incorporate for a company for tax reasons.