| 1. | The sea is mainly composed of water and salt ... 海主要由海水和盐组成。 |
| 2. | Water is composed of hydrogen and oxygen . 水由氢与氧化合而成。 |
| 3. | Nuclei are composed of protons and neutrons . 原子核是由质子和中子构成的。 |
| 4. | Water is composed of hydrogen and oxygen . 水是由氢和氧组成。 |
| 5. | Water is composed of the elements hydrogen and oxygen . 水是由氢、氧元素组成的。 |
| 6. | Limestone is rock composed of calcium carbonate . 石灰石是由碳酸钙所构成的岩石。 |
| 7. | This tissue is composed of stellate reticular cells . 此组织由星形的网状细胞组成。 |
| 8. | Each disaccharide is composed of two monosaccharides . 每一种双糖都是由两个单糖组成。 |
| 9. | Gunpowder is composed of sulfur, carbon, and potassium nitrate . 火药是由硫、碳和硝酸钾组成。 |
| 10. | A polysaccharide is composed of three or more monosaccharides . 多糖是由三个以上的单糖所组成的。 |