1. Words are the elements of a sentence.
   词是句子的组成部分。
2. They are the undesirable elements among the employees.
   他们是雇员中的不良分子。
3. Cells are the elements of the human body.
   细胞是人体的基本单位。
4. A supernova sprays space with many different elements.
   超新星会向宇宙放射不同种类的元素。
5. Dispersed repetitive sequence is mainly transposable elements which are composed of transposon and retroposon.
   散在重复序列主要是可转移因子,可转移因子分为转座子和返座子两种类型。
6. The contents of trace elements and mesne elements changed gently in the growing season.
   中量元素和微量元素的含量随着生长有所增加，但是波动不大。
7. He told us stories of how he had battled the elements on his mountaineering trips.
   他给我们讲述他登山时是怎样顶住坏天气的。
8. The elements of physics are difficult to grasp.
   物理原理是很难掌握的。
9. Magnesium is the nutrient element in plant growth.
   镁是植物生长的营养要素。
10. Kelp is rich in vitamins and trace elements.
    大型褐藻富含维他命和微量元素。
11. Oxygen is one of the basic elements of substance.
    氧是物质的基本元素之一。
12. Carbon is an element,while carbon dioxide is a compound.
    碳是一种(化学)元素,而二氧化碳则是一种化合物。
13. There is an element of truth in what you say.
    你的话有些真实性。
14. A language teacher should initiate pupils into the elements of grammar.
    语言老师应该把基本语法教给学生。
15. Fig.2—8 SEM observation of the isolated secondary wall from tracheary elements.
    图2—8为扫描电镜下观察到的管状分子离体次生壁。
16. Semimetal Brake Materialsconsist of reinforcing fiber,friction element,lubricste elementand polymer.
    半金属制动材料是由增强纤维、增塑剂、摩擦组元、润滑组元和树脂组成的。
17. Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.
    初生木质部的成分，最早由原形成层形成。
18. I tried to avoid the back room where the undesirable elements were gathered.
    我尽力避开后屋, 那里聚集了讨厌的人。

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